Could someone please help?
I'll mark brainliest. Also giving 30 points


You have just learned that in much of nature, the structure of a body part or organ is related to its function—the lesson provided you with some examples. For example, a maned wolf has very long legs (structure). You could deduce that those long legs will help the wolf travel more easily in its environment (it lives in grassland with tall grasses). Think about your own favorite animal, plant, or other organism. If you can, include a link to a website with photos or illustrations of this organism. Comment on how that organism’s structure relates to its function.

A mutagen is a physical or chemical agent that permanently changes genetic material, usually DNA, in an organism and increases the frequency of mutations. Mutagens are used in genetic research to induce mutations and study their effects on organisms.

A mutagen is a physical or chemical agent that permanently changes genetic material, usually DNA, in an organism and increases the frequency of mutations above the natural background level. Mutagens are used in genetic research to induce mutations and study the effects of these mutations on organisms. They are used to investigate gene function, understand the causes of genetic diseases, study the mechanisms of evolution, and develop new treatments for diseases.

Answer:

A) he phenotypic ratio is

short & black : short & brown

8:8

1:1

Genotypic Ratio is  

LLBb : LLbb: LlBb : Llbb

4:4:4:4

1:1:1:1

B)

Genotypic Ration

LLBb : LLbb: LlBb: Llbb: llBb: llbb

2: 2: 4: 4: 2:2

1:1:2:2:1:1

Phenotypic ratio

Short & Black : Short & brown: Long & black : Long & brown

6: 6: 2: 2

3:3:1:1

Explanation:

Given -

Allele for short hair (L) is dominant over long hair allele (l)

And Black hair allele (B) is dominant over brown hair allele (b)

A) Genotype for dihybrid short and black rabbit is LlBb

Genotype for homozygous short and brown rabbits is LLbb

Cross between LlBb and LLbb will result into following offspring

LB         Lb          lB           lb

Lb LLBb LLbb LlBb Llbb

Lb LLBb LLbb LlBb Llbb

Lb LLBb LLbb LlBb Llbb

Lb LLBb LLbb LlBb Llbb

Hence, the phenotypic ratio is

short & black : short & brown

8:8

1:1

Genotypic Ratio is  

LLBb : LLbb: LlBb : Llbb

4:4:4:4

1:1:1:1

B) LlBb*Llbb.

LB         Lb         lB          lb

Lb LLBb LLbb LlBb Llbb

Lb LLBb LLbb LlBb   Llbb

lb LlBb Llbb         llBb         llbb

lb LlBb Llbb         llBb          llbb

Genotypic Ration

LLBb : LLbb: LlBb: Llbb: llBb: llbb

2: 2: 4: 4: 2:2

1:1:2:2:1:1

Phenotypic ratio

Short & Black : Short & brown: Long & black : Long & brown

6: 6: 2: 2

3:3:1:1

Answer:

A virus is a tiny infectious biological agent that can only replicate or duplicate inside the host cell. These infectious agents can infect all different types of living organisms ranging from animals and plants to microorganisms and archaea and bacteria.

Virions are ineffective particle or form of the virus outside of the host cell, with RNA or DNA and a protein capsid.

The main role of these infectious agent virions is to transfer the DNA or RNA genome from itself to the cell of host and expressed the gene which means produce proteins from the genome transferred to the host cell.

Answer:A

Explanation:

Answer: A. True

Explanation: "Peristalsis. Peristalsis is a series of muscular contractions that propel food through the small intestine. These kinds of controls help you get the most nutrients out of your food. ... This coordinated contraction of smooth muscle keeps food moving on its one-way path through your digestive system."

Answer:

Asthma refers to a disease in which swelling of the airways results in the restriction of airflow into and out of the lungs. During the occurrence of an asthma attack, the production of the mucus gets increased, the bronchial tree muscles become constricted, and the inflammation of the air passages lining occurs. This further minimizes the flow of air and generates a kind of wheezing sound.  

The bronchodilators quickly help in relieving the symptoms of acute asthma by opening the airways. The activity of inhaled bronchodilator begins some minutes post inhalation and endures for two to four hours.  

All the kinds of steroids minimize swelling in the airways, which transports air towards the lungs and minimize the generation of mucus produced by the bronchial tubes. This makes one breathe easily.  

The inhaled steroids cure swelling of the airways, and only a very minute concentration of it gets captivated by the body. Thus, these medicines do not seem to result in any kind of serious side effects in a long run.  

Answer:

Degenerate.

Explanation:

Genetic code may be defined as the codons of three nucleotides that can be inherited to the next generation. The codons codes for the particular amino acids.

The degeneracy of the genetic code means the a single amino acids is coded by more then one codons. For example: Leucine is coded by UUG as well as UUA.

Thus, the correct answer is option (b).

Answer:

2. Mushroom 3. Sunlight

Explanation:

2. A mushroom is a fungus not an animal

3. Sunlight is not alive animals, plants, and decomposes are.

Answer:

Termination factor.

Explanation:

Translation may be defined as the process of formation of the protein from the RNA molecule y the help of enzymes and translation factors. The translation occurs in 5' to 3' direction.

The three main steps of the translation are initiation, elongation and termination. The release factors or translation termination factors binds to the stop codons and results in the translation termination. Prokaryotes release factors include RF1, RF2, and RF3 that binds to the stop codons.

Thus, the correct answer is option (c).

Answer:

b. all eukaryotes have mitochondria (or their remnants), whereas many eukaryotes do not have plastids.

Explanation:

It is a fact that among eukaryotes, all the reresentatives of the Domain (Eukarya) have mitochondria (more or less modified) but not all of them posses plastids.

Indeed, only a selected group of eukaryotes have acquired plastids. This group includes the autothropic algae (e.g. green algae or Chlorophytes, red algae or Rodophytes, brown algae or Phaeophyceae, etc), briophytes, and traqueophytes (vascular plants, pteridophytes, conifers and flowering plants). The endosymbiotic event that led to the formation of a plant cell initially involved an eukaryotic heterotrophic cell (that already had mitochondria and nucleus) which phagocyted a cyanobacterium. Over time, this cyanobacterium transformed into the plant cell's plastid.

Answer:

If an individual Drosophila has two or more populations of cells comprising different genotypes from one single egg then it is termed as twin spots or mosaic.

Explanation:

There might be different reasons for mosaic to occur like

Nondisjunctioning of the chromosomes

Lag in anaphase

Endoreplication

Mutations in a single cell

Mitotic recombination:

One of the major ways through which mosaic or twin spots arise is the mitotic recombination. It is also termed as somatic cross over. Twin spot or mosaic generally occurs if there is linking of heterozygous genes in repulsion. The recombination generally happens among the centromeres from the adjacent genes.

A common example of the mitotic recombination is the Bloom's syndrome. Bloom's syndrome is caused due to the mutation that occurs in the blm gene. As a result, there are defects in the BLM protein produced.

Answer:

Phosphofructokinase-1

Explanation:

Phosphofructokinase-1 catalyzes the phosphorylation of fructose 6-phosphate into fructose 1,6-bisphosphate. The reaction is exergonic with a large negative free energy change to make it essentially irreversible.  

Phosphofructokinase-1 is an allosteric enzyme with regulatory sites. Higher ATP concentration serves to inhibit the phosphofructokinase-1 by binding to the allosteric site of the enzyme and thereby reducing its affinity for the substrate (fructose 6 phosphate).

Hexokinase is a glycolytic enzyme that catalyzes an irreversible conversion of glucose to glucose-6-phosphate, which is critical for the continuation of the glycolytic pathway.

One enzyme of glycolysis that catalyzes an essentially irreversible step is hexokinase. This enzyme is responsible for the phosphorylation of glucose, producing glucose-6-phosphate at the beginning of the glycolytic pathway. Such a reaction is biologically irreversible, meaning the enzyme cannot readily catalyze the reverse reaction. In fact, this step is so crucial that when hexokinase is inhibited, glucose can diffuse out of the cell, preventing it from becoming a substrate for cellular respiration.

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Answer:

C. Get tested because her father could be a carrier

Explanation:

As Huntington Disease is an inherited dominant disease, it means that is enough the presence of one allele to develop illness. Her paternal grandfather was affected but not her father great-great grandmothers.  Is her father, carrier of an HD allele? The problem here is that we can’t be sure her father is not a carrier, because although he’s 40 years old and doesn’t show symptoms of illness, HD uses to appear between 30 to 50 year old ages, but it can appear at any age.   Eventually a possibility for the disease to appear, is still possible.

Answer:

The correct answer will be option-true.

Explanation:

Follicular stimulatory hormone or FSH and inhibin are the complex proteins which play a various biological role in the reproductive system.

The FSH stimulates the secretion of inhibin from the gonads in both males (Sertoli cells) and females (granulosa layer). The production of inhibin suppresses the secretion of FSH from the pituitary gland.

The suppression of FSH directly suppresses the secretion of further inhibin and thus, option-true is the correct answer.

Answer:

c. 28

Explanation:

Plant A has a dipoid chromosome number of 12, so its gametes will have an haploid number of 6 chromosomes.

Plant B has a dipoid chromosome number of 16, so its gametes will have an haploid number of 8 chromosomes.

The new species C arises as an allopolyploid from A and B. An allopolyploid usually originates from the breeding of two different species.

In this case, a gamete from plant A combines with a gamete from plant B to form a hybrid with 14 chromosomes (6 from A and 8 from B). These chromosomes are unpaired, so the hybrid is sterile.

In order to become a fertile diploid individual of species C, the most common mechanism is polyploidization, where the genome duplicates. That way, the resulting plant C has a diploid number of 14 x 2 = 28 chromosomes, of which 12 are A and 16 are B.

Species C, being an allopolyploid of species A and B, would likely have a diploid number that is the sum of the diploid numbers of species A and B. In this case, that is 28.

The new species C, being an allopolyploid of species A and B, is formed by a combination of the whole sets of chromosomes from both species A and B. Thus, we would add together the diploid numbers of both species to determine the diploid number of species C. Plant species A has a diploid chromosome number of 12 and plant species B has a diploid number of 16. Adding these together gives us a total diploid number of 28. Therefore, the correct answer would be option c. 28.

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Answer:

The correct answer will be option-B.

Explanation:

The plant tissues are composed of three types of cells: parenchyma, collenchyma and sclerenchyma.

The parenchyma and collenchyma remain alive at their maturity but sclerenchyma loses their protoplasm and become dead. These cells deposit lignin in their secondary walls and form hard tissues of the plant-like hard shell of a coconut. Sclerenchyma provides mechanical strength to the plant.

Thus, Option-B is the correct answer.

Answer:

c. The molecule responsible for making the blue color is RNA.

Explanation:

Tube (a): DNA, RNA and proteins present ⇒ BLUE

Tube (b): DNA and RNA present ⇒ BLUE

Tube (c): DNA and proteins present ⇒ COLORLESS

Tube (d): RNA and proteins present ⇒ BLUE

RNA is the only molecule that is present every time the chamical is added and the tubes turn blue, and not present when the color doesn't change, meaning in tube (c) there's no reaction with the added chemical.

In conclusion, RNA is the only molecule reacting with the chemical and responsible for blue appearance.

Answer:

The correct option is: B. Contraceptive diaphragm

Explanation:

Contraception, also known as birth control, are the various methods like barrier methods, hormonal contraception, sterilization, intrauterine devices, and behavioral methods, that are used to prevent pregnancy.

The hormonal method of contraception includes vaginal rings, injections, patches and oral contraceptive pills. This contraceptive method involves the use of steroid hormones- estrogen, progestin, and progesterone.

Whereas, the barrier method of contraception includes condoms, contraceptive sponges, diaphragms and the fertility awareness methods.

Therefore, contraceptive diaphragm is not a hormonal method of contraception.

Answer:

The correct answer is b. False

Explanation:

More than 90% of bacteria present in the world is not harmful to human beings. Human body contains trillions of bacteria in their intestine which play important role digestion of food absorption of nutrients inside the small intestine.

Human gut contains 10 times more bacteria than the cells present in human body. This proves that bacteria lives in symbiotic association with humans and human body cannot survive without them.

Thus a large percentage of bacteria are not harmful to humans rather they are important part of human body and these bacteria are called human microbiota.

Answer:

B.

Explanation:

Flourescent insitu hybridization-This technique permits the direct analysis of sequences of DNA or RNA in tissues

-Through this technique various chromosomal abnormalities can be determined as it focuses on that part of the DNA for which a complementary probe has been used.

-The method involves the denaturation of DNA  in a tissue section followed by the application of a labeled probe which is complementary to the sequence of  interest.  

Answer:

Water carries several physical properties such as chemical formula, appearance, boiling point, freezing point, density, viscosity and solvency.

An increase in temperature changes the density of water. When a water is heated or its temperature is allowed to increase it causes the water molecules to gain energy and move faster, which results in increase in water volume due to movement of water molecule far from each other. on the other side if temperature of water is decrease, it's molecules come closer to each other and decrease in the volume of water takes place.

The correct answer is E. 0

Explanation:

The deciduous dentition or baby teeth refer to the first set of teeth human have before the permanent teeth, these teeth are prevalent during infancy and include 20 teeth: 4 central incisors, 4 lateral incisors, 4 canines and 8 molars divided into 4 primary molars and 4 secondary ones. In the case of premolars, these are part of permanent teeth but not of deciduous teeth as they only appear after deciduous teeth begin being replaced and these replace the molars in deciduous dentition. Thus, the number of premolars in deciduous dentition in humans is 0.

Answer:

The correct answer is option a. "True".

Explanation:

Bufo marinus is the world's largest toad, it is native from South and Central America but it has been introduced to islands in Oceania and the Caribbean. Bufo marinus rapidly flipps its tongue to catch its prey for eating and defensive purposes. Bufo marinus has its tongue attached at the anterior part of the buccal cavity, while posterior margin of the tongue lies freely. This morphology allows Bufo marinus to make the quick movement needed to catch its prey.

Answer:

True.

Explanation:

Taxonomy may be defined as one of the main branch of biology that helps in the classification of organisms. The organisms are classified on the basis of similarities and differences among them.

Taxonomy includes the identification of an individual by looking at its morphological characters. The nomenclature ( naming of organism) and its classification in to different groups.

Thus, the correct answer is option (a).

Answer:

The correct answer is option B. Bufo Marinus.

Explanation:

The cane toad a american species of toads that is known as its scientific name Rhinella marina which is formerly known as Bufo Marinus. Commonly called neotropical toad which is large, land toad found in central and south America.

These toads are the world's largest toads that are known for their invasive properties as they grow and reproduce incredibly fast.

Thus, the correct answer is option B. Bufo Marinus.

Answer and explanation:

The garden pea had many advantages to be used as a model in inheritance studies. These plants grow very fast, so you can rise several generations in little time. This fundamental if you want to do this kind of studies. The study object needs to have a brief generational time, so they can be selected and their descendants can be raised again. Another advantage was that garden peas can be raised easily. They don't need any special care. Besides, they were common in the market. Mendel could find them and bought them any time that he wants. Also, they presented visible characteristics that could vary from one plant to another. Some pea gardens had violet flowers, while others had white flowers. Some were tall, while others were small. These made possible to select plants with specifics features and to study if they could transmit these features to the next generations.

It could be really difficult to do the same experiment in humans. several years would have to pass to observe new generations, so during the lapse time of the researcher, only a few human’s generations could be studied.

Cellular respiration breaks down carbon skeletons obtained from polysaccharides, proteins, and lipids for energy.

Carbon skeletons to be broken down during cellular respiration can be obtained from polysaccharides, proteins, and lipids. This means option E is correct.

A controlled experiment is one that tests experimental and control groups in parallel, with all other variables kept constant. This enables the scientist to observe the impact of a single variable.

A controlled experiment is one that can be defined as an experimental set up in which the scientist keeps all variables constant, except for the one being studied. The correct option here would be option 'b'. Such an experiment tests experimental and control groups in parallel.

This methodology allows the researcher to observe the effect of one variable on the study subject while ensuring that all other conditions remain the same. For example, if you were to experiment with plant growth, you might keep factors like sunlight, water, and type of soil constant while changing the type of fertilizer used.

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Answer:

in the cell nucleus

Explanation:

Most DNA is located in the cell nucleus where it is called a nuclear DNA.