Answer:
Mutation, Gene flow/Migration/Immigration of gene and Recombination
Explanation:
For any species there are majorly three sources of genetic variations –
a) Mutation – This leads to change in the genetic code with in the DNA of an organism. Sometimes mutation does not produce any effect on the organism. Mutation can produce both positive and negative impact. Its effect is observed in long run as its rate is slow.
b) Recombination – When an organism undergoes sex, his/her genes recombine with the genes of mating partner. The rate of recombination is faster than the rate of mutation
c) Gene flow /Migration/Immigration of gene – In this gene travel from one set of population to the other. The frequency of gene in the mixed population lies between the original population gene frequency and the migrated or donor population gene frequency
True or false: Brain imaging studies examining brain development in childhood show that the amount of brain material in some areas can nearly quadruple within as little as a year.
Answer:
True
Explanation:
Which of the following is not an example of exponential growth?
A. rabbit populations after being introduced to Australia
B. reindeer of the Pribilof Islands after eating most of the lichens
C. a bank account that earns interest
D .mold appearing on bread overnight
Answer:
B. reindeer of the Pribilof Islands after eating most of the lichens
Explanation:
Exponential growth refers to the specific way that a quantity may increase over time. It occurs when the instantaneous rate of change of a quantity with respect to time is proportional to the quantity itself.
From the above options:
B. reindeer of the Pribilof Islands after eating most of the lichens is the correct answer because if we ake a look at the other options;
a rabbit populations after being introduced to Australia may have undergone some behavioral modifications that makes it to change drastically over the course of time.
a bank account that earns interest increases with time.
mold appearing on bread overnight is as a result of bacteria formation and it also increase with time.
Answer:
B
Explanation:
The nursing instructor is teaching the students about anesthesia and informs them that there are two types. What are those two types of anesthesia? (Select both that apply.)A. Local anesthesiaB. Topical anesthesiaC. General anesthesiaD. Regional anesthesiaE. Spinal anesthesia
Answer:
The answer is C and D.
Explanation:
Although there are more than two types of anesthesia, 3 to be exact, which are local, general and regional, the two types of main anesthesia are;
1 - General Anesthesia which renders the subject unconscious for an operation or treatment.
2 - Regional Anesthesia which blocks the registration of pain for a certain body part so that the patient does not experience the pain during the procedure.
I hope this answer helps.
A woman who is a carrier for hemophilia marries a hemophiliac man. What will be their children’s possible phenotypes?
Answer:
Hemophilia is a sex-linked recessive disorder in which a person's blood do not clots and he can bleed to death even after minor injuries because blood will keep running due to a small cut.
It is a recessive trait which means that even if one normal gene is present along with Hemophiliac gene, the person will not have the disease and he will be the carrier.
Question: What will be their children’s possible phenotypes?
If a woman who is a carrier for hemophilia marries a hemophiliac man, their genotypes can be denotes as :
Here H, indicate normal gene and small h indicate defected (hemophilia) gene.
Parents: XHXh X XhY
Offspring: XHXh : XHY: XhXh: XhY
Phenotype of offspring:
XHXh: The child will be daughter and normal (25 % chances)
XHY: The child will be son and normal (25 % chances)
XhXh: The child will be girl and Hemophiliac (25 % chances)
XhY: The child will be son and Hemophiliac (25 % chances)
Hope it helps!
Which statement is true about DNA ? a.Both of the original DNA strands act as templates during replication. b.It is a single-stranded molecule. c.Only one of the original DNA strands acts as a template during replication. d.Its replication takes place in the cytosol.
Answer:
The correct answer is a. Both of the original DNA strands act as templates during replication.
Explanation:
During the DNA replication both the strands of the DNA act as the template strand. DNA polymerase is the enzyme that replicates both the DNA strand.
One of the strand of DNA gets continuously replicated which is called the leading strand. While the other strand is replicated in a discontinuous manner called lagging strand.
As due to discontinuous replication in the lagging strand short DNA fragments are formed called Okazaki fragments which are joined together by DNA ligase. So both the original DNA strands act as template during replication.
Answer:
The answer to this question is both of the original DNA strands act as templates during replication.
Explanation:
To add proof of the correct answer, I attached a file to help you guys out.
Hope this helps! :)
Medicines are often administered in pill form. In many cases, the active ingredient of the pill (the drug) is joined to another substance by ________. This forms a/an ________, which is stable in the dry environment of a pill bottle but dissociates under the wet conditions of the digestive system to release the drug to the body.
a. covalent bonds; salt
b. ionic bonds; salt
c. ionic bonds; acid
d. hydrogen bonds; base
Answer:
Option B, ionic bonds; salt
Explanation:
All medicines either in the form of pills or liquid interact with our body by forming a bond with target specific receptors. For instance if a pain killer is taken then it shall form bond with receptors produced by pain and inflammation
So medicines are basically chemical which interact with biomolecules such as enzymes, nucleic acid, hormones, ions etc. by forming ionic bond, hydrogen bond, van der wall force etc. in the active site of enzyme.
These salt molecule remain stable in normal conditions but as they come in contact with digestive system of the body (with different pH) they release the drugs
Hence, option B is correct
In the case of a specific ____________, the anxiety produced by the given stimulus or situation is typically disproportionate to the actual threat the stimulus or situation poses.
Answer:
phobia
Explanation:
Phobia defined as irrational fear against something. The fear will cause anxiety feeling that make the threat feels much bigger than it should be. (For example, some people have a phobia of insects, and will scream uncontrollable and sobbing every time they see one of them)
A person will determine a situation as dangerous or threatening based on their past experience. This will vary greatly, which make phobia can come from any condition. Many phobias not comes from a dangerous or life-threatening condition but acquired from a really unpleasant memory.
Which of the following characterizes the lag phase of the bacterial growth curve?
Answer:
Little increase in cell number
Explanation:
There are four distinct phases in the bacterial growth curves that is lag, log, stationary and death phase. The lag phase of the bacterial growth curve is characterized by very little increase in the cell number.
The growth rate of bacteria in the lag phase is slow because the medium is new to the bacterial culture and it requires time for bacteria have to adapt to the new cultural environment and to synthesize enzymes required for substrate utilization.
After getting adapt in their new environment bacteria starts to grow at an exponential rate. So little increase in cell number characterizes the lag phase.
Which of the following correctly lists the levels of compaction in eukaryotes from naked DNA to the most compact?
a. solenoid, nucleosome, looped chromatin (300-nm fiber), metaphase chromosome
b. solenoid, metaphase chromosome, nucleosome, looped chromatin (300-nm fiber)
c. metaphase chromosome, nucleosome, solenoid, looped chromatin (300-nm fiber)
d. nucleosome, solenoid, looped chromatin (300-nm fiber), metaphase chromosome
e. nucleosome, looped chromatin (300-nm fiber), metaphase chromosome, solenoid
Answer:
The level of compaction in Eukaryotes from naked DNA to the most compact is:
d. nucleosome, solenoid, looped chromatin (300-nm fiber), metaphase chromosome
Explanation:
As we know that the
Diameter of DNA is 2 nm.Diameter of nucleosome is 11 nm.Diameter of solenoid is 30 nm.Diameter of looped chromation is 300 nmDiameter of meta-phase chromosome is 1400 nmAll of these facts depict that the the least compact is DNA and most compact is meta-phase chromosome.
If Japanese workers are more productive than French workers, then trade between Japan and France
A) can take place only if France has an absolute advantage in producing a good or service Japanese buyers want.
B) cannot take place because Japanese goods and services will be less expensive than French goods and services.
C) cannot take place until French workers become more productive.
D) will take place so long as each country has a comparative advantage in a good or service that buyers in the other country want.
Answer:
Option D, will take place so long as each country has a comparative advantage in a good or service that buyers in the other country want.
Explanation:
Trading or globalization is a concept where services or goods of one nation can be exported to other nation in terms of some monetary benefits of technological advancement. Two nations will be into a trading partnership till the service or goods of the two nations provide a comparative advantage over and above trading with any other nation. Thus, France shall be taking benefits of better productivity of its workers for meeting out the demand of its citizens in lieu to provide open market for business opportunities in other sectors as well to japan.
Hence, option D is correct
Trade between Japan and France can take place as long as each country has a comparative advantage in a good or service that the other country wants.
Explanation:In this scenario, the correct answer is D) trade between Japan and France will take place so long as each country has a comparative advantage in a good or service that buyers in the other country want.
Comparative advantage refers to the ability of a country to produce a good or service at a lower opportunity cost than another country. If Japanese workers are more productive than French workers, Japan would have a comparative advantage in producing certain goods or services. Similarly, if French workers are more productive than Japanese workers in other areas, France would have a comparative advantage in those goods or services.
Therefore, trade between Japan and France can occur if each country specializes in producing the goods or services in which they have a comparative advantage, and then they can trade with each other to obtain the goods or services that they do not produce efficiently.
Which of the following is an example of an extended product responsibility? Select one: a. ecotourism b. soft loans for business planning to implement environmental products c. the use of recycled wood products in the manufacture of new products d. tradable emission permits
The use of recycled wood products in the manufacture of new products is an example of an extended product responsibility.
Explanation:An example of an extended product responsibility is the use of recycled wood products in the manufacture of new products. This is an example of a company taking responsibility for the environmental impact of its products by using sustainable materials in their production.
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Final answer:
Option c. The use of recycled wood products in the manufacture of new products is an example of extended product responsibility. This concept is about companies taking responsibility for their product's environmental impact throughout its life cycle, in contrast to other market-oriented environmental policies.
Explanation:
An example of extended product responsibility is option c. the use of recycled wood products in the manufacture of new products. This concept entails that companies are responsible for the environmental impacts of their products throughout the product’s life cycle, including post-consumer use. This is in contrast to options like ecotourism, tradable emission permits, and soft loans for business planning, which are more aligned with market-driven environmental strategies or incentives for sustainable practices. The principle behind extended product responsibility is to encourage waste minimization and facilitate a closed-loop production system, ultimately leading to sustainable consumption and reduced negative environmental impacts.
Purchase of 'green' products, such as those using sustainably sourced timber or manufactured with recycled materials, represents a commitment to biodiversity conservation and often comes with higher costs. Consumers demonstrate their willingness to take on these costs for the sake of supporting environmentally responsible practices. Tradable emission permits, on the other hand, fall under market-oriented environmental policies, which serve to integrate the social costs of negative externalities into the economic activities that cause them.
Use the phylogenetic tree to the right to determine which statement below is true.
Organisms A and F are not related.
Organism E is more closely related to organism B than organism F.
Organisms C and D are more closely related than organisms A and B.
Answer:
Organisms C and D are more closely related than
Organisms A and B
Explanation:
Organisms A and B are not related much as the distance between them is more than the organisms C and D so the C and D are closer than A and B. The phylogenetic tree shows the biological evolutionary relationship among various biological species. So the given tree shows the relationship as mentioned above.
It also show the physical and genetic relationship among the various biological species. The phylogeny is generally shown by using a particular phylogenetic tree. For example, the simple one below which describes the different evolutionary relationships between the great apes. The genus Pongo includes orangutans, Pan includes chimpanzees and bonobos, and Homo includes humans, while Gorilla is self-evident.
Organism relationships are based on a phylogenetic tree which shows "organisms C and D are more closely related than organisms A and B" as the true statement.
Explanation:The phylogenetic tree visually represents the evolutionary relationships among different biological species, supporting the described relationships. Organisms A and B are distantly related, indicated by their greater evolutionary distance compared to organisms C and D, which suggests that C and D are more closely related than A and B. This tree also conveys both the physical and genetic connections among these species. Phylogeny is typically depicted using specific phylogenetic trees, such as the simplified one below, illustrating the diverse evolutionary relationships among great apes. In this context, the genus Pongo encompasses orangutans, Pan includes chimpanzees and bonobos, Homo encompasses humans, and Gorilla represents gorillas.
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In order to stimulate an effector in a toe, which pathway does a nerve impulse follow after it is initiated at a receptor?
A. sensory neuron -> interneuron -> motor neuron
B. motor neuron -> interneuron -> sensory neuron
C. interneuron -> sensory neuron -> motor neuron
D. None of these
Answer:sensory nuerone to internuerone to motor neurones
Explanation:
The sensory nuerone usually receive inputs from the receptors cells in the skin,organs,and other parts of the body.
These receptors send signals as action potential to the spinal cord to the brain.(CNS).
Synapse take place at the synaptic junctions, in the spinal cord with the internuerone.
The latter transmit the action potential to the motor neuron which synapse with the internuerone and transmita signal to the neuromuscular junction where it synapse with the muscels at the toe.
The action potentials causes influx of calcium ions and the relase of acetylcholine neurotransmitters for action potential to reach the toe muscles (effector)for contraction
The correct answer to the question is option A. sensory neuron -> interneuron -> motor neuron.
The correct pathway for a nerve impulse from a receptor to an effector in a toe is sensory neuron -> interneuron -> motor neuron. This pathway involves sensory neurons, interneurons, and motor neurons in a reflex arc. This process is fundamental for initiating quick, involuntary responses to stimuli.
Pathway of a Nerve Impulse to an Effector in a Toe
In order to stimulate an effector, such as a muscle in a toe, a nerve impulse follows a specific pathway after being initiated at a receptor. The correct pathway is:
Sensory neuron: Transmits information from the sensory receptors to the central nervous system (CNS).Interneuron: Relays the information within the CNS, typically the spinal cord, as part of the processing and decision-making steps.Motor neuron: Carries the impulse from the CNS to the effector (muscle or gland), causing a response.Types of Neurons Involved
Sensory neurons: These neurons transmit information from sensory receptors to the CNS.Interneurons: These neurons are part of the CNS and are involved in the processing of information and decision-making.Motor neurons: These neurons send signals from the CNS to muscles or glands to initiate a response.This pathway forms what is known as a reflex arc, which is a fundamental mechanism for reflex actions. For example, when you step on a sharp object, the pain receptors in your foot send a signal through the sensory neurons to the spinal cord, where interneurons process the signal and immediately send responses through motor neurons to pull your foot away.
Write the letter all of the following statements that are NOT true. a. Coding sequences for gene products can be isolated from cDNA libraries. b. Antibodies are used for Northern blot analysis. c. VNTRs are highly conserved in human populations. d. PCR amplification generates large numbers of linear DNA fragments. e. RNA molecules can be used as hybridization probes in Southern blot analysis.
Antibodies are used for Northern blot analysis and VNTRs are highly conserved in human populations are the following statements that are NOT true.
b. Antibodies are used for Northern blot analysis.
c. VNTRs are highly conserved in human populations.
Explanation:
The antibodies cannot be used for Northern blot analysis. The northern blot analysis detects the RNA molecules precisely among the group of RNA.
The sample of RNA is taken from specific cell type or tissue and is analyzed to measure the RNA expression of particular genes.
A variable number tandem repeat (VNTR) is found on many chromosomes, and it varies in length from each and every person.
Some early methods of contraception include which of the following? a. Lemons b. Papaya seeds c. Cotton d. All of these
Answer:
D. All of these
Explanation:
Women in the past used sponges soaked in lemon juice to prevent pregnancy. The citric acid in lemons acts as a natural spermicide. The lemon rind itself (with pulp and juice removed) could be used as a cervical cap. Unripe papaya was used to prevent or terminate pregnancy. ... The seeds of the papaya could actually serve as an effective male contraceptive. Papaya seeds, taken daily, could cut a man's sperm count to zero and was safe for long-term use. The cotton could be seen as a tampon, but was also quite effective as a method of birth control.
When surface fires occur, they release valuable plant nutrients that had been tied up in slowly decomposing litter and undergrowth.True / False.
Answer:
True
Explanation:
Surface fires have several ecological benefits such as
a) They only burn litter and other flammable waste materials and prevent huge forest fires.
b) The important minerals that are held within the litter are released which would have otherwise remained within the slowly decomposing waste
c) It prevents several diseased and promotes the growth and development of certain trees.
d) It also releases seeds and thus causes sprinting after fire thereby preserving habitat for animals.
Hence, the given statement is true
a_____that tells you how you will be graded on an assignment or assessment is called a_____
A grading rubric is a tool that outlines the criteria and expectations for an assignment or assessment, providing guidance on how it will be graded. It is used in various subjects and grade levels.
Explanation:The term that describes how you will be graded on an assignment or assessment is called a grading rubric. A grading rubric is a tool that outlines the criteria and expectations for the assignment, and it often includes a scoring scale or specific guidelines for each level of achievement. For example, in a math class, a grading rubric might specify that correct calculations are worth a certain number of points, while showing work and providing explanations are worth additional points.
Grading rubrics are used in various subjects and at different grade levels, including Mathematics, History, English, Biology, Chemistry, Physics, Social Studies, Advanced Placement (AP), SAT, Geography, Health, Arts, Business, Computers and Technology, French, German, Spanish, World Languages, Medicine, Law, and Engineering.
SEO Keywords: grading rubric, assignment, assessment, criteria, expectations, scoring scale, math class, calculations, work, explanations, subjects, grade levels.
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Over time, humans have become increasingly dependent on which of the following in order to cope with the range of environments they have occupied in time and space?
Answer:
there are various factors on which humans have depended over the years .they are discussed below:-
Explanation:
in order to cope with the range of environments over the years ,humans have become increasingly dependent on a wide variety of food so that they can adapt to their environment .for example in winters people mostly use dry fruits and in summers the eating and drinking habits totally change.besides that , the clothing stuff had also contributed to changing environment.
Most importantly , the use of technology have increased a lot .humans have become dependent to a lot usage of technology over the years, in order to cope up with the environment.
Dna is a double-stranded molecule made up of complementary _______
Answer: bases
Explanation:
Three different alleles (c1, c2, and c3) at the c locus exist in a hypothetical population of juniper trees. If the frequency of c1 is 0.3, the frequency of c2
a) cannot be less than 0.3.
b) cannot be greater than 0.3.
c) is 0.7.
d) cannot be greater than 0.7.
Answer:
d
Explanation:
When considering the frequency of the potential alleles of a gene in a population, the total must add up to 1. Think of it like percentages. an allele frequency of 0.3 means 30% of the population carry it (out of a possible 100%).
We know that the frequency of c1 is 0.3. Lets take each option and see if it can be true
a) cannot be less than 0.3. - false. It could be less than 0.3. For example, it could be 0.1, meaning the frequency of allele c3 would be 0.6 (because 0.3 + 0.1 + 0.6 = 1)
b) cannot be greater than 0.3. - false. It could be greater than 0.3. For example, it could be 0.5, meaning the frequency of allele c3 would have to be 0.2 (because 0.3 + 0.5 + 0.2 = 1)
c) is 0.7. - false. It can't be 0.7, because that would mean that the frequency of c3 is 0. (0.7 + 0.3 = 1)
d) cannot be greater than 0.7. - true. It cannot be greater than 0.7, because that would mean that the frequency of c3 is 0. (0.7 + 0.3 = 1)
Given the allele frequencies in a population should add up to 1, if the frequency of allele c1 is 0.3, the frequencies of c2 could, theoretically, range from 0 to 0.7. Hence, the frequency of c2 cannot be greater than 0.7.
Explanation:The question relates to frequencies of alleles in a population of juniper trees. There are three possible alleles, denoted c1, c2, and c3 and we are given that the frequency of c1 is 0.3. Considering the principle of population genetics, the total of allele frequencies in a population should add up to 1. In this case where there are three alleles (c1, c2, and c3), if the frequency of c1 is 0.3, then the combined frequencies of c2 and c3 would be 0.7 (1 - 0.3).
Therefore, the frequency of c2 could be any value from 0 to 0.7. The only suitable answer provided is option d) cannot be greater than 0.7.
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The broadest way to classify the nervous system is to differentiate between the ______ nervous systems.
Answer:
Central and Peripheral
Explanation:
The nervous system is divided into two parts: the central nervous system and the peripheral nervous system. The central nervous system includes the brain and spinal cord.
On the other hand the peripheral nervous system includes all of the nerves that branch out from the brain and spinal cord and extend to other parts of the body including muscles and organs. Each part of the system plays a vital role in how information is communicated throughout the body.
The below diagram provides a schematic view of the role of each sub-division of the Nervous System.
Asexual reproduction during which a bacterium clones itself and splits into two genetically identical organisms is called ________.
Answer:binary fission
Explanation: bacteria are Unicellular prokaryotic organisms.
Reproduction involves one parent and so they do not produce gametes.
Since they do not have nucleus,they do not undergo mitosis .
They possess a long DNA strand which replicates itself. the cell membrane then divides to form two new daughter cells which are genetically identical to their parents.
Which statement describes a situation where the process of cellular respiration is not working properly in a cell?
Answer:
Option D, A Golgi apparatus is unable to package a protein due to lack of ATP
Explanation:
Please see the attachment
Where is the Electron Transport System (ETS) located in prokaryotic cells?
Answer:
Cellular membrane.
Explanation:
In prokaryotes electron transport chain isIn prokaryotes electron transport chain is located in the cell membrane. ETC is defined as the series of complexes which helps in the transfer of electrons from electron donors to electron acceptors via reduction, and oxidation reaction couple the transfer of protons with electron transport across a member.
The primary function of the ETC is generated a transmembrane proton electrochemical gradient, such as oxidation, and reduction reaction.
How can you determine the most effective antibiotic to treat a pathogenic bacterial infection?
Answer:How you can determine the most effective antibiotic to treat a pathogenic bacterial infection is the use of antibiotic sensitivity test.
Explanation: sensitivity analysis is a test that determines the “sensitivity” of bacteria to an antibiotic. It also determines the ability of the drug to kill the bacteria. The results from the test can help your doctor determine which drugs are likely to be most effective in treating the bacterial infection.
This is the largest digestive organ. One of its functions is to receive matter from the portal vein.
Which organ is it?
A. small intestine
B. liver
C. pancreas
D. gallbladder
Answer:
the correct option is B.
Explanation:
the liver is the second largest digestive organ in our body which receives portal vein. 1st is skin but it does not receive the portal vein.
liver performs many important and vital processes that are necessary for the body to function normally. for example . it performs detoxification, helps in bile production, stores the nutrients and most importantly as mentioned above it receives portal vein .
so, the correct option is B.
Which situation would inhibit a Krebs cycle from functioning in an organism’s cells?
Answer:
If the formation of Acetyl CoA does not occur.
Explanation:
A Krebs cycle which is also known as the citric acid cycle, is a cycle showing parts or series of chemical reactions to generate energy by aerobic organisms.
The acetyl coA is converted to two carbon molecule, that is, oxaloacetate, which enters the Krebs cycle.
During which phase in the control of the digestive system would bicarbonate and bile be stimulated?
1. cephalic phase
2. gastric phase
3. intestinal phase
Answer:
3. intestinal phase
Explanation:
Intestinal phase starts at the first segment of the small intestinal where we have the duodenum. In this phase, the partly digested food called chyme stimulates the enteroendocrine cells of the duodenum causing the release of the secretin hormone. The secretin is one of the hormones in the duodenum. It is a peptide hormone that functions mainly in regulating the acidity of the duodenum. The secretin hormone stimulates the secretion of bile in the liver and also initiates the secretion of bicarbonate in the pancreas in response to the acidity of the chyme.
In binomial nomenclature, the genus functions as a(n) , and the species functions as a(n) .
In binomial nomenclature, the genus represents a broader categorization of related species, and the species denotes the specific type of organism within that category, like in Homo Sapiens, where Homo is the genus, and Sapiens is the species.
Explanation:In the binomial nomenclature, which is a scientific system of naming species, the genus functions as a broader categorization and the species functions as a specific designation within that category.
For example, in the name of the species Homo Sapiens, Homo refers to the genus, which encompasses all types of human species that exist or have existed, and Sapiens is the specific species that represents modern-day humans. The genus (Homo) indicates the related group of species, while the species (Sapiens) denotes a specific organism within that group.
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The change in genetic composition of a population due to sampling (a random event) best describes:
Answer:Genetic drift
Explanation:
This is the change in genetic composition due to the random sampling of the genes in the population