Answer:
A. DNA and not protein is the genetic material.
Explanation:
Hershey and Chase's experiment proved that DNA is the genetic material. In their experiment with radiolabelled protein coat of phage, the infected bacterial did not exhibit any radioactivity. This proved that the protein coat of the phage does not enter the bacterial cell to cause the infection and is not the genetic material
On the other hand, the infected bacteria exhibited radioactivity when DNA of phage of radiolabelled. This proved that DNA was the genetic material since the DNA of the phage entered the bacteria, not the protein.
Answer:
the answer is a
Explanation:
i took the test on penn foster and got it right
What do scientists call the aliens and odd organisms that live below the bottom of the ocean?
Intraterrestrials are what scientists call aliens odd organisms that live
below the bottom of the ocean.
There are organisms which live deep in places in the biosphere such as the
following:
Deep in water bodies such as oceansDeep in rock particlesThese organisms are mostly unicellular and possess prokaryotic cells which
aids their survival in such conditions. The organisms ranges from viruses,
archaea etc.
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What is an allele? A. Trait form that is hidden by a dominant gene B. One of different forms of the same gene C. Trait form that is displayed by recessive genes D. Identical copies of two different genes
In which of the following areas is wind a major erosional agent?
Question 13 options:
grasslands
temperate forests
deserts
tropical rain forests
Answer:
Deserts
Explanation:
A desert is an arid region without no rainfall and land cover in form of soil or vegetation.
Erosion is the wearing or the removal of earth materials.
In a desert region where the surface is exposed and annual rainfall or any other means of precipation is low experiences massive wind erosion. It is common to find loose sand materials and highly friable clayey particles in a desert. Running water and glalciers would have little to no impact here.
Six-year-old Lydia presents with her mother with a chief complaint of I dont feel well and I have a rash. Mom states it started yesterday on her face and is much worse today. Lydia has had a fever for two days and complains of a sore throat. What questions would you include in your history and what characteristics of the physical assessment would help in determining the origin?
Which of these describes loose connective tissue? (A) It is a loose weave of fibers that functions as a packing material. (B) It is composed of many fibers that connect bone to bone and muscle to bone. (C) It is a rigid material that provides structural support. (D) It transports nutrients and gases from one part of the body to another.It plays a role in padding, insulation, and energy storage.
Answer:
A.it is a loose weave of fibers that functions as a packing material
Loose connective tissue is a loose weave of fibers that functions as a packing material.
One form of connective tissue is called loose connective tissue which has a disordered arrangement of fibers. It acts as a packing material by filling organ gaps, supporting and cushioning delicate structures. It is composed of cells, fibers (including elastic and collagen fibers) and ground material. Such tissue serves as a source of padding, insulation and stored energy. Areolar tissue and adipose tissue are two examples of loose connective tissue.
Therefore, the correct option is A.
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The medial edge of the popliteal fossa is created by which muscle?
A.
Gracilis
B.
Semitendinosus
C.
Biceps femoris
D.
All of the above
Answer:
B. Semitendinosus
Explanation:
The medial edge of the popliteal fossa is created by Semitendinosus muscles.
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Which of the following describes a phenomenon that occurs when we observe plants that wilt?
A. The xylem releases all its water.
B. The stomata close, cutting off transpiration and gas exchange.
C. The roots begin to rot, causing them to no longer uptake water.
D. The plant begins absorbing oxygen and releasing carbon dioxide into the atmosphere.
Answer:
A: The xylem releases all it's water
Explanation:
This is so because wilting is the loss of rigidity of non-woody parts of plants. This occurs when the turgor pressure in non-lignified plant cells falls towards zero, as a result of diminished water in the cells. The rate of loss of water from the plant is greater than the absorption of water in the plant.
Answer:
A
Explanation:
Janice is in the middle of a distinct period of an abnormally and persistently elevated mood. In the last week she has cleaned her house from top to bottom (breaking windows and dishes in the process), bought a new car that she can’t afford, and dug up most of her yard in case she might want a garden next year. Janice is experiencing ________.
Answer:
Mania
Explanation:
Mania is one of the phases of bipolar disorder characterized by a state of intense euphoria, with increased energy, agitation, restlessness, mania of grandeur, less need for sleep, and may even cause aggression, delusions and hallucinations. People infected with this disease exhibit strange behavior with abnormal and derogatory attitudes.
The symptoms associated with mania are similar to what Janice is showing. Janice probably has the disease, but only a professional diagnosis can prove it.
Which of the following best describes the main purpose of the combined processes of glycolysis and cellular respiration?1 breaking down ATP, so that ADP and P can be reused2. producing complex molecules from chemical building blocks3 the breakdown of glucose to carbon dioxide and water4 transforming the energy in glucose and related molecules in a chemical form that cells can use for work5 catabolism of sugars and related compounds
Answer:
4. transforming the energy in glucose and related molecules in a chemical form that cells can use for work
Explanation:
Glycolysis breaks down glucose into two molecules of pyruvate which is transformed into acetyl CoA to enter the Kreb's cycle. Kreb's cycle breakdown the acetyl CoA into CO2 and H2O. The energy stored in the glucose molecule is released during glycolysis and Kreb's cycle. The released energy is stored in the form of NADH and FADH2 as well as in few molecules of ATP.
The NADH and FADH2 enter the final step of cellular respiration, the oxidative phosphorylation. Here, NADH and FADH2 are oxidized with the help of electron transport chain (ETC). During the transfer of electrons through ETC, the proton motive force is generated which then helps in ATP synthesis.
Hence, the three steps of cellular respiration (glycolysis + Kreb's cycle + oxidative phosphorylation) retrieve the energy from nutrients such as glucose and store it in the form of ATP. ATP is used by cells as an energy source for various other functions.
Myelin Select one: a. is released from a neuron and travels to another neuron. b. consists of layers of lipids and proteins that wrap around an axon. c. is produced in response to bacterial infection. d. is a form of chromatophilic substance that fills Schwann cells.
Answer:
B
Explanation:
Myelin creates a sheath of lipids and proteins that wrap around an axon.
What are the general steps of the Scientific Method, in order?
General steps of the Scientific Method, in order:
1. Observe
2. Ask questions
3. Make a hypothesis
Final answer:
The scientific method is a structured approach to inquiry that includes steps such as making observations, asking questions, conducting research, forming hypotheses, testing these hypotheses, analyzing data, drawing conclusions, and communicating results.
Explanation:
The scientific method is a systematic approach to research and problem-solving in science. It follows a specific series of steps to ensure that conclusions are based on systematically gathered and analyzed evidence. The general steps, in order, are as follows:
Make observations: This is the process of gathering information about phenomena or systems of interest to prompt further investigation.Formulate a question: Based on initial observations, a specific question that seeks to explain the phenomena is posed.Conduct research: Investigate existing sources to understand what is already known about the subject or problem.Form a hypothesis: Develop a testable prediction that provides a possible answer to the research question.Test the hypothesis: Conduct experiments or collect data to test the validity of the hypothesis.Analyze the data: Look at the results to determine if they support or refute the hypothesis.Draw conclusions: Based on the data analysis, decide whether the hypothesis was correct. If the hypothesis is incorrect, consider alternative explanations.Communicate results: Share findings with others through publication, presentations, or other forms of dissemination.The scientific method is an iterative process, meaning that these steps are often repeated to refine hypotheses and increase the understanding of the subject matter.
Which enzyme breaks the hydrogen bonds during replication?
The enzyme known as helicase plays a pivotal role in the process of DNA replication by effectively breaking the hydrogen bonds that exist between the two complementary strands of DNA.
Explanation:Helicase, a vital enzyme in DNA replication, assumes the crucial task of unwinding the DNA double helix. Its primary function is to disrupt the hydrogen bonds, which are responsible for holding the two strands of DNA together. As these bonds are severed, the DNA strands separate, providing access to the genetic information they contain. This initial unwinding step is essential for DNA replication to proceed accurately and efficiently.
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The enzyme responsible for breaking hydrogen bonds during DNA replication is DNA helicase. It unwinds the double-stranded DNA, separating the strands for replication.
During DNA replication, the enzyme responsible for breaking the hydrogen bonds between the complementary nitrogenous bases is called DNA helicase. DNA helicase plays a crucial role in the unwinding of the double-stranded DNA molecule. It functions by traveling along the DNA double helix, using energy from ATP hydrolysis to separate the two strands by disrupting the hydrogen bonds that hold the base pairs together.
As DNA replication progresses, the leading and lagging strands are exposed, making them accessible for the replication process. DNA polymerases can then synthesize new complementary strands on each of the separated parent strands. This process ensures the accurate duplication of genetic information by unwinding and separating the DNA strands and allowing them to serve as templates for the synthesis of new DNA molecules.
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Tall height is dominant to short height in pea plants. You have a tall pea plant that you cross with a short pea plant. What is the genotype of the tall parent if some of the offspring are short? The tall parent was homozygous dominant and the offspring were all homozygous dominant The tall parent was homozygous dominant There is not enough information to answer this question. The tall parent was heterozygous The offspring were all homozygous dominan
Answer:
The tall parent was heterozygous
Explanation:
If tall height is dominant to short height the only genotype possible for short height is hh, while there are two possible genotypes for tall height, Hh and HH. When HH is crossed with hh all the offspring are Hh, but if Hh is crossed with hh, a quarter of the offspring is HH, a quarter is hh and half is Hh. If the tall pea plants were HH there would only be tall offspring, but because there are some short offspring we know that the tall pea plants must have a genotype of Hh.
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RNA primase synthesizes RNA primer that attaches itself at the initiation point of replication. RNA primer constructed during DNA replication needs to be replaced because RNA differs from DNA. It contains __________ instead of ________.
In the plasma, the quantity of oxygen in solution is ________.
A. not present except where it is combined with carrier molecules
B. about equal to the oxygen combined with hemoglobin
C. greater than the oxygen combined with hemoglobin
D. only about 1.5% of the oxygen carried in dissolved form
Answer:
D. only about 1.5% of the oxygen carried in dissolved form is correct answer.
Explanation:
Plasma is a component of blood, it has many functions in our body like fighting against diseases, clotting the blood.
In the plasma, the quantity of oxygen in solution is about 1.5% of the oxygen carried in dissolved form and 98.5% of the oxygen is bound to hemoglobin.
Thus option (D) only about 1.5% of the oxygen carried in dissolved form is correct.
In the plasma, only 1.5% of the oxygen is carried in dissolved form. Most oxygen is carried by hemoglobin in red blood cells.
Explanation:In the plasma, the quantity of oxygen in solution is generally quite small. The correct answer is D. only about 1.5% of the oxygen carried is in dissolved form. Most of the oxygen in the blood is actually carried by hemoglobin, a protein found in red blood cells. Hemoglobin binds to oxygen in areas of high oxygen concentration, such as in the lungs, and releases it in areas of lower concentration, such as in the body's tissues. Only a small fraction of the oxygen — about 1.5% — is dissolved directly into the plasma.
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The different types of muscle tissue differ from each other by
The different types of muscles tissues that are differ from each other is anatomy, microscopic, location and type of control.
What are the functions of muscle tissues?Muscles are the largest soft tissues of the musculoskeletal system. Muscle is derived from the Latin word “musculus” meaning “little mouse”. The muscle cell, muscle fibre, contains protein filaments of actin and myosin that slide past one another, producing contractions that move body parts.
The 3 types of muscle tissue are cardiac, smooth, and skeletal. Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control.
Smooth muscle tissue is non-striated and involuntary. Smooth muscle is found within the walls of organs and structures such as the esophagus, stomach, intestines, bronchi, uterus, urethra, bladder, blood vessels.
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Which statement about life on Earth is true? a)Dinosaurs appeared before insects. b)Dinosaurs and insects appeared at the same time. c)Humans have been on Earth for hundreds of millions of years.d) Humans have been on Earth for a very short amount of time.
Humans have been on Earth for a very short amount of time is true about life on earth.
Dinosaurs and Insects appeared in the Devonian period which translates to
around 160 million years ago while humans has existed on earth for about 3
million years.
When doing comparison of life of humans on earth with insects, dinosaurs
and when life on earth came into existence which is about 4500 million years we will observe that Humans have been on Earth for a very short amount of time.
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Most of the weathering of Cleopatra’s Needle is caused by ____.
Question 16 options:
hydrolysis
chemical weathering
oxidation
frost wedging
Answer:
chemical weathering
Explanation:
The Cleopatra's Needle is a monument in New York. Its origin actually lies in Egypt, and it has been in Egypt for over 3,000 years, but it has been sent to New York as a gift for the United States by the Egyptians. While the monument already was partially damaged by weathering in the desert in Egypt, the weathering increased significantly ones the monument was brought in New York. The chemical weathering in New York has been much stronger, with constant acid rains and freeze-thaw cycles doing a lot of damage to the red granite by which the monument is made off. A plan has been made to preserve it, as its surface has been totally damaged, with the hieroglyphs nowhere to be found.
What does the equipotentiality hypothesis suggest would happen if the hippocampus was damaged? a. another part of the brain would compensate for the damage by taking over the memory function normally managed by the hippocampus b. areas near the hippocampus would decay, followed by a cascading failure of the brain leading to death c. people would lose their ability to feel fear d. people would become comatose
Answer:
a. another part of the brain would compensate for the damage by taking over the memory function normally managed by the hippocampus
b.areas near the hippocampus would decay, followed by a cascading failure of the brain leading to death
c. people would become comatose
d. people would lose their ability to feel fear
Explanation:
Equipotentiality is the hypothesis that the brain can transfer functional memory from injured to intact areas. Therefore, option (A) is correct.
What is equipotentiality hypothesis?The concept of equipotentiality postulates that, in the event of a brain injury, the brain is able to move functional memories away from the region of the brain that has been injured and into other regions of the brain that have not been affected by the injury. Karl Spence Lashley included this concept as a component of his law of mass action that he developed.
If the hippocampus were damaged, the equipotentiality hypothesis suggests that another part of the brain would compensate for the damage by taking over the memory function that is normally managed by the hippocampus.
Therefore, option (A) is correct.
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Study of the Human Race
Humanities
Philosophy
Sociology
Economics
ANSWER:
The study of human race is Humanities. Humanities refer to academic disciplines that study the humans in terms of their society and culture.
EXPLANATION:
Humanities are a broad field that covers several disciplines that are used to study different aspects of the humans.
Humanities involve the study of history, culture, languages, arts, philosophy etc. related to the human race. Humanities as academic discipline can have wide content related to different aspects of humans.
How did wegner’s theory of continental drift differ from the current theory of plate tectonics
Answer:
Wegners theory was that continents have drifted apart over time todays theory now called the pangea that all the pieces of the continents could be fitted back together as a puzzle
Explanation:
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Which neurotransmitter would you expect to see in high quantities, if you could, in the brain of someone who has just been rewarded with a large raise in salary for all his or her hard work?
A. Acetylcholine
B. Serotonin
C. Epinephrine
D. Dopamine
Answer:
The correct answer would be option D. dopamine.
Explanation:
Dopamine is a catecholamine neurotransmitters produce from tyrosine. It plays a role in different pathways, is involved in many pathological conditions including the reward circuit, and addiction.
Dopamine is attached to reward center, so if you feel interested or excited for anything, then the levels of dopamine will increase in the prefrontal cortex. High level of dopamin motivates brain to remember facts or incidents presented to one.
Thus, the correct answer would be option D. dopamine.
Which of the following would be a body response when stepping outside without a coat on a snowy day?
A. Blood vessels in the skin narrow and contract.
B. More liquid is transported by the body to the skin for insulation.
C. Sebaceous glands secrete more sebum.
D. Blood vessels in the skin expand
Answer:
A. Blood vessels in the skin narrow and contract.
Explanation:
If we will step outside without a coat on a snowy day then our blood vessels in the skin will become narrow and contract. It is a mechanism to conserve heat within our body in cold weather. If the blood vessels in the skin will become narrow and contract then less blood will flow in the blood vessels, this phenomenon is known as vasoconstriction. The blood of our body is warm but the exposure to the cold weather will cause the heat of the blood to dissipate into the environment. But constricted blood vessels will have less blood and hence heat loss is minimized which keeps the internal temperature of the body as normal even if outside environment is cold.
Answer:
A. Blood vessels in the skin narrow and contract.
Explanation:
Which functional area of the brain is responsible for keeping the cortex alert and conscious and enhancing its excitability?
Answer:
Reticular formation
Explanation:
The reticular formation is the netlike region and consists of interspersed gray and white matter. Reticular activating system (RAS) is a sensory part of the reticular formation and is responsible for consciousness. RAS of reticular formation obtains sensory information from eyes, ears, etc. Its projections into the cerebral cortex regulate sensory signals that reach the cerebrum.
RAS of reticular formation is responsible for keeping the cerebral cortex alert to maintain the attention of the individuals. The projections of the sensory part of reticular formation also regulate the excitability of cerebral cortex by releasing acetylcholine and noradrenaline (the excitatory neurotransmitters).
What term refers to the point below the surface where an earthquake begins? A. Hypocenter B. Seismic zone C. Seismogenic zone D. Epicenter
Answer:
A. Hypocenter
Explanation:
Hypocenter refers to the point below the surface where an earthquake begins.
The earthquake beginning is at A) Hypocenter.
Explanation:The area inside the Earth, which acts as the source of origin of earth quake is called as center (or hypocenter) of the seismic tremor. The point at Earth's surface straightforwardly above the hypocenter is known as the focal point of the quake.
The shaking will be experienced more at this region as it is the source of the origin. Here and there the ground surface breaks along the fault. Once in a while, the development is profound underground and the surface doesn't break.
________ is one of a group of sleep disorders in which unwanted, disruptive motor activity and/or experiences during sleep play a role. A. insomnia B. NREM phase C. parasomnia D. REM phase
Answer:
I believe the answer is parasomnia
Explanation:
Parsomnia are conditions that produce unwanted, disruptive motor activity such as sleep walking.
Answer:
C. parasomnia
Explanation:
Parasomnia is one of a group of sleep disorders in which unwanted, disruptive motor activity and/or experiences during sleep play a role.
Which of the following does not describe a function of aggressive animal behavior?
A. Aggressive behavior is displayed to establish territorial boundaries.
B. Aggressive behavior leads to fights that allow strong animals kill off weaker members of the species.
C. Aggressive behavior is displayed to establish hierarchy without violence.
D. Aggressive behavior is displayed to determine who is allowed to mate
Answer:
C
Explanation:
Aggressive behaviour is a act of violence not without it
Answer:
The correct answer is option C.
Explanation:
Aggressive behaviour is a type of behaviour which is widespread in the animal kingdom. Animals display this behaviour by expressing it in the form of anger and violence.
Animals use this behaviour mostly to establish its dominant nature in front of the opponent in the competition. This allows animals to either kill an animal in a fight (violence) or establish territorial boundaries and some species compete to mate with the female individual.
Thus, option C is the correct answer.
Which of the following provides a first line of defense against pathogens? Which of the following provides a first line of defense against pathogens? intact skin and mucous membranes complement inflammation antimicrobial proteins
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Which of the following does not generally occur?
A. A fertilized egg splitting into two embryos
B. A single sperm fertilizing a single egg
C. Two sperm fertilizing two different eggs at the same time
D. Two different sperm both fertilizing the same egg
Answer:
D
Explanation:
Microbes are often identified using biochemical tests that detect specific enzymes of metabolic pathways. E. coli typically ferments lactose, whereas Shigella does not. If a pure culture of each bacterium was placed in a tube containing lactose as the only food source, and a chemical indicator changed color after a pH change, what would the tubes look like after the bacteria were incubated?
Answer: There will be change in the tube in which E.coli will be incubated and there will be no change in the test tube in which Shigella is incubated
Explanation:
Lactose Fermentation Test is done to see which bacteria ferments lactose. pH and color indicator is attached to observe the change. The pH goes slightly down because of formation of Acid and due to this reason a color change is also seen during this test.
As E.coli typically ferments lactose so there will change in color and pH in the test tube incubated with E.coli, while there will be no change in the test tube incubated with Shigella.