Biology High School

When scientists classify living things, they do not include viruses. This is because viruses
A) cause disease.
B) do not contain DNA.
C) are not made of one or more cells.
D) are much smaller than other organisms.

Answers

Answer 1

the answer is:

C. are not made of one or more cells.

Related Questions

In which situation would the stroke volume be the greatest? when venous return is increased when venous return is decreased when the force of contraction is decreased when the difference between edv and esv is small when calcium channel blockers are present?

Answers

The correct answer is "when venous return is increased".

This is because when the venous return from the pulmonary veins to the left atrium and subsequently the left ventricle, there will be an increase in the left ventricular filling pressure and volume or the preload which in turn will result to increased left ventricular stroke volume.

The other choices will cause a decrease in stroke volume.

The situation in which the stroke volume would be the greatest is when venous return is increased. The correct option is A.

When the venous return is increased, there is a larger volume of blood returning to the heart from the venous system.

This increased blood volume fills the ventricles during diastole and leads to a greater preload (stretch) of the cardiac muscle fibers. This increased filling leads to a greater stretch of the cardiac muscle fibers (preload) and results in a more forceful contraction. As a result, the stroke volume is likely to be greater when venous return is increased.When venous return is reduced, there is a decreased amount of blood returning to the heart.As a result, the preload and stretch of the cardiac muscle fibers are reduced, leading to a weaker contraction.

Thus, the correct option is A.

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Complete question:

In which situation would the stroke volume be the greatest?

A. when venous return is increased

B. when venous return is decreased

C. when the force of contraction is decreased

D. when the difference between EDV and ESV is small

E. when calcium channel blockers are present

Henrietta gets a phone call that she is going to be laid off from her job. henrietta is scared and shocked. in response to this stressor, her pituitary gland has received a signal from her hypothalamus to release a hormone called:

Answers

Adrenocorticotropic Hormone,an important component of the suprarenal pituitary hypothalamic axis and often occurs in response to stress. Its main effects are the increase in production and the release of cortisol by the cortex of the adrenal gland. Adrenocorticotropic hormone is also related to the circadian rhythm of many organisms.  

The cell shown above is forming a cleavage furrow as the first stage of cytokinesis. To which organism does the cell pictured likely belong?


Answers

Final Answer:

The cell shown forming a cleavage furrow as the first stage of cytokinesis likely belongs to a multicellular organism, specifically an animal.

Explanation:

The process of cytokinesis, specifically the formation of a cleavage furrow, is a characteristic feature of animal cells undergoing cell division. This distinct mechanism is employed by animal cells to complete the process of cell division during mitosis and meiosis. The cleavage furrow is formed as a result of the contraction of the actin-myosin ring, leading to the physical separation of the two daughter cells. This mechanism is not observed in plant cells, which typically form a cell plate during cytokinesis.

Therefore, based on the presence of a cleavage furrow, we can confidently conclude that the cell in question is from an animal organism.Animal cells exhibit unique features during cell division, such as the absence of a rigid cell wall and the involvement of microfilaments in the formation of the cleavage furrow. The contractile ring, consisting of actin and myosin filaments, contracts and pinches the cell membrane, resulting in the formation of two distinct daughter cells.

This process is vital for the growth and development of multicellular animals. In contrast, plant cells, which possess a rigid cell wall, form a cell plate to divide during cytokinesis. Therefore, the identification of a cleavage furrow is a key indicator that the cell belongs to an animal organism, highlighting the importance of understanding the unique characteristics of cell division mechanisms in different organisms.

Complete Question:

The cell shown above is forming a cleavage furrow as the first stage of cytokinesis. To which organism does the cell pictured likely belong?

Explain the biological reason children tend to avoid new foods. review

Answers

Because they are scared that they won’t like it or scared to eat it.

If you observed the sister chromatids separating during cell division, what phase of mitosis would you be observing?

Answers

This is the anaphase of mitosis. Anaphase is characterized by the separation of sister chromatids or "pulling away" of the sister chromatids from the metaphase plate to the opposite spindle poles. This is also the phase where chromosomes reach its maximum condensation meaning that the process of the reformation of the nucleus will be shorter and easier.

The best sign that a 1-year-old is securely attached is when the child:

Answers

The correct answer is "his primary caregiver can calm him down easily after being separated".

Starting at 6 months of age up to the age of 2 years old, a child may experience what we called separation anxiety. At this age, the child is able to represent in its mind that what he cannot see does not exist. This is manifested by signs of extreme neediness of the child. When the child eventually outgrows this phase, then the child is now securely attached and the caregiver can calm him down easily after being separated.

50 Points! Easy. You are making up your own organism and writing about 3-5 adaptations it has to survive in the Alpine biome.

Answers

You can so an animal like and elk and give it 
 extra fur
 camaflouge 
a way to hunt food

WHAT IN THE WORLD IS THE ALPHINE BIOME!?!?!?!?!?!?!?!! (-_-)

The masculinity/feminity index (mas), identified by geert hofstede, focuses on risk orientation.
a. True
b. False

Answers

The correct answer is true

What is the function of the keratin found within skin cells?

Answers

I believe keratin functions to prevent water loss from the skin. Keratin is a protein mostly found in the hair, skin and nails. It can also be found in internal organs and glands, it is a protective protein, less prone to scratching or tearing than other types of cells produced by the body. Therefore, keratin serves important structural and protective functions, especially in the epithelium, the have also been found to regulate cellular activities such as cell growth.
Final answer:

Keratin found within skin cells provides hardness and water-resistant properties to the skin, protecting it from water loss, microbial growth, and degradation by bacterial enzymes.

Explanation:

The function of keratin found within skin cells is to provide hardness and water-resistant properties to the skin. Keratin is a type of structural protein that is produced by keratinocytes, which are the predominant cells found in the epidermis. The keratin in skin cells, along with fatty acids on the skin's surface, helps create a tough and waterproof barrier that protects the body from water loss, microbial growth, and degradation by bacterial enzymes.

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Which characteristic of lymphatic capillaries is correct? which characteristic of lymphatic capillaries is correct? they have smaller diameters than blood capillaries. they typically have a rounded, regular appearance in sectional view. they originate as pockets rather than forming continuous tubes. they have thicker walls than blood capillaries?

Answers

The correct answer is "they originate as pockets rather than forming continuous tubes". 

This is because lymphatic capillaries are small, thin walled vessels that are closed at one end (originate as pockets). This end is located in the interstitial tissue wherein the lymphatic capillaries drain the excess interstitial fluid. Lymphatic capillaries are also located in the digestive tract wherein they act as the conduit for fat absorption (cisterna chyli).

Final answer:

The characteristic of lymphatic capillaries that is correct is they originate as pockets rather than forming continuous tubes, allowing them to effectively collect interstitial fluid.

Explanation:

The correct characteristic of lymphatic capillaries is that they originate as pockets rather than forming continuous tubes. Unlike blood capillaries, which are the smallest vessels of the vascular system with a continuous structure, lymphatic capillaries are formed by overlapping endothelial cells that can open to allow interstitial fluid to enter when interstitial pressure increases. Thus, they begin as closed-end tubes (or pockets) that do not form a continuous network like blood capillaries.

A food with a high energy density has a small number of calories per ounce of weight. false

Answers

This is false, a high energy density means that there are a high number of calories in a given mass of the food. For example fats have a high energy density.

Levinson placed the greatest weight on the five periods of adulthood. what are these five periods?

Answers

1. infanc
.2. toddler
3.preteen
4.teenager
5. Adulthood

The five periods of stress in the period of adulthood of a person are as follows:

1. Early period of transition to adulthood

2. Entering adulthood

3. Period of transition during the age of 30 years

4. Period for settle down

5. Transition of midlife

These are the periods described by Levison, which are faced by adults.

The human capacity for storing long-term memories is

Answers

I believe the human capacity for storing long-term memories is essentially unlimited.  Human brain consist of about a billion neurons. Neurons combine such that each one helps with many memories at a time, exponentially increasing brain's memory storage capacity to something closer to around 2.5 million gigabytes. Information entering the brain may enter the short term memory and some of it is transferred to the long-term memory.

The human capacity for storing long-term memories is around 2.5 petabytes.

The human capacity for storing long-term memories is vast and difficult to quantify precisely. The brain has a remarkable ability to store an immense amount of information over a lifetime.

While it is challenging to provide an exact measure of storage capacity, estimates suggest that the human brain may have the potential to store around 2.5 petabytes of information.

Thus, the capacity for long-term memory storage is not solely determined by the storage space but also involves various complex processes in the brain.

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A client admitted 72 hours ago with a diagnosis of major depression presents for breakfast today appropriately dressed and well groomed, and appears to be calm and relaxed, yet more energetic than before. which initial action should the nurse take after noting this client's behavior?

Answers

I think that the nurse should first spend time with the client and ask the client to state positive things about themselves. The nurse should also try and discuss the client's concern. This is because symptoms of major depression do not just go away in 72 hours. It takes time for anti-depressants to take effect and produce maximum benefits.

Answer:

The correct answer is "ask the client if she or he has any suicidal thoughts".

Explanation:

One of the most important and complicated labors of a nurse is to ask a person about the presence of any suicidal thoughts. Is the nurse's responsibility to ask this question to any person diagnosed with major depression. Given that this client has major depression but with episodes of apparent calmness, it is particularly important lo look for suicidal thoughts, because many people that takes his own life experiences this episodes of apparent calmness.

How do psychologists describe the human memory system?

Answers

''Psychologists use memory models to think and communicate about memory. Information-processing models involve three processes: encoding, storage, and retrieval. The connectionism information-processing model views memories as products of interconnected neural networks. The three processing stages in the Atkinson-Schiffrin model are sensory memory, short-term memory, and long-term memory. More recent research has updated this model to include two important concepts: (1) working memory, to stress the active processing occurring in the second memory stage; and (2) automatic processing, to address the processing of information outside of conscious awareness.''
Final answer:

The human memory system is often described through the Atkinson-Shiffrin model, which suggests memory operates in three stages: Sensory Memory, Short-Term Memory, and Long-Term Memory. This model characterizes memory as an information processing system where memory functions include encoding, storing, and retrieving information.

Explanation:

Psychologists describe the human memory system using a model called the Atkinson-Shiffrin model of memory, first proposed by Richard Atkinson and Richard Shiffrin in 1968. This model suggests that memory passes through three distinct stages: Sensory Memory, Short-Term Memory, and Long-Term Memory. Memories first enter our sensory memory where they stay for less than a second to a few seconds before those we pay attention to move into short-term memory. With the process of rehearsal, they then move into long-term memory for permanent storage. This model likens human memory to an information processing system, similar to a computer, where memory functions are classified into three basic operations: encoding, storing, and retrieving information.

In addition to this model, other models, like that proposed by Baddeley and Hitch, suggest a more complex system involving a feedback loop between short-term and long-term memory.

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How does the random movement of molecules bring about an even distribution of molecules throughout the system?

Answers

Diffusion is the random movement of molecules or particles from a region of high concentration to a region of low concentration bringing a natural flow in the system. Diffusion ensures that there is a state of equilibrium in the number of molecules in the system.

Manta rays, sting rays, and eagle rays are similar to lampreys in that they have cartilagenous skeletons. how are they different from lampreys?

Answers

I think they are different in that they have jaws. Rays are predominantly marine and are found in all the oceans. Many are slow-moving bottom dwellers. They include, Manta ray which is one of the most known type of rays, Spotted eagle ray (pacific ocean), sting ray  among others. They are about 15 types of rays in the oceans.  Sharks, Lampreys and rays, like all fishes they are aquatic, water-breathing vertebrates with a brain and spinal cord, fins, plate-like pairs of internal gills, and paired sense organs. 

What discovery by t.h. morgan finally determined that genes were carried on chromosomes?

Answers

it would be x and y chromosomes 

The identification of sex-linkage in fruit flies by T.H. Morgan led to the conclusion that genes were carried on chromosomes.

T.H. Morgan's discovery of sex-linkage in fruit flies led to the conclusion that genes were carried on chromosomes. According to Morgan and his colleagues, some features, like eye colour, showed different inheritance patterns connected to the sex of the parent. They came to the conclusion that these features had a connection to the sex chromosomes as a result. They discovered, in particular, that the fruit fly eye colour gene was carried on the X chromosome, which offered strong support for the notion that genes are contained on chromosomes.

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Look at Figure 19–7 p.544. Which of the following explains why the edges of Africa and South America fit together like two pieces of a puzzle?

Answers

This question is incomplete. However, the answer to this question is Continental Drift. Approximately 300 million years ago, there were not separate continents, only one giant super continent that we call Pangaea. Over time, scientists realised that the Earth's outer shell slides over the inner mantle through plate tectonics. Around 200 million years ago, Pangaea began to break up through the process of continental drift. Gondwana, incorporating present-day Africa, South America, Antarctica, India and Australia, split from Laurasia (Eurasia and North America). Approximately 150 million years ago, Gondwana started to break up into the present day continents

The final step of the healthcare reimbursement process is this?

Answers

I think the last step is Reconciliation. This is the process the healthcare provider analyzes received payment information compared to submitted claim information for accuracy. If the provider believes that the claim was inappropriately denied by the payer, the dispute process begins until satisfactory reconciliation is achieved by the provider and the third party payer.

The final step is the actual transfer of funds, either to the healthcare provider from the insurance company and/or the patient, or directly to the patient if the patient has already paid and is seeking reimbursement.

The final step of the healthcare reimbursement process is the payment to the healthcare provider or the reimbursement to the patient.

To elaborate, the healthcare reimbursement process typically involves several steps:

1. Service Delivery: The patient receives medical services from a healthcare provider.

2. Submission of Claim: The healthcare provider submits a claim to the insurance company detailing the services provided and the associated costs.

3. Claim Processing: The insurance company reviews the claim for accuracy and coverage eligibility based on the patient's insurance policy.

4. Adjudication: The insurance company determines the amount they will pay for the services rendered. This may involve applying deductibles, copayments, and coinsurance as outlined in the patient's policy.

5. Explanation of Benefits (EOB): The insurance company sends an EOB to the patient, which details the services covered, the amount paid, and any remaining balance for which the patient is responsible.

6. Payment: The insurance company issues payment to the healthcare provider for the amount covered under the patient's policy. If there is a remaining balance after insurance has paid its portion, the patient is responsible for paying this balance directly to the healthcare provider.

7. Reimbursement to Patient: In cases where the patient has paid the healthcare provider out-of-pocket, the insurance company may reimburse the patient for the amount covered under their policy, minus any deductibles, copayments, or coinsurance.

Strength gains with ____ training are specific to the angle of muscle contraction.

Answers

The answer is isometric training. To simplify, the strength gains with isometric training are specific to the angle of muscle contraction. In addition, Isometric exercise or isometrics are a kind of strong physical activity in which the joint angle and muscle length do not alter throughout contraction likened to concentric or eccentric contractions or as called as dynamic or as isotonic activities.

Why do some kinds of point mutations (substitution) generally result in greater changes in proteins than others?

Answers

Frameshift will affect the one base and substitution and deletion affects the sequence of bases

Some kinds of point mutations (substitution) generally result in greater changes in proteins than others because they occur in certain regions of proteins that are critical for its function.

What is a point mutation?

Point mutations are changes in a single nucleotide in a gene. It can be in the form of substitution, deletion, alteration, etc.

They can have a significant impact on the function of protein that is produced from that gene. The extent to which a point mutation affects a protein can depend upon several factors, including the location of the mutation and the type of mutation.

Overall, the extent of point mutation impacts a protein depends on the specific detail of the mutation and the protein in the question and can only be determined through careful study and experimentation.

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Which is part of the nonspecific immune response?
A.Lymphocytes
B.Fever
C.B cells
D.Making antibodies

Answers

Final answer:

Fever is part of the nonspecific immune response and helps the body fight off infections.

Explanation:

The part of the nonspecific immune response among the given options is Fever. Fever is a natural response of the body to fight off infections. When pathogens enter the body, the immune system releases chemicals that raise the body's temperature, making it difficult for the pathogens to survive and replicate.

Lymphocytes, B cells, and making antibodies are all part of the specific immune response. Lymphocytes, specifically T cells and B cells, are involved in recognizing and destroying specific pathogens. B cells produce antibodies, which are specific proteins that target and neutralize pathogens.

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Immediately after gastrulation:
1. The embryo forms a blastula
2. Sperm travel to the oviduct
3.The body axis of the embryo appears
4.The fetus’ circulatory system begins to mature

Answers

Immediately after gastrulation:

1. The embryo forms a blastula.

- Gastrulation is the process during embryonic development where the three primary germ layers (ectoderm, mesoderm, and endoderm) are established.

- Following gastrulation, the embryo transitions into the next developmental stage, which is the formation of a blastula.

- During blastulation, the cells arrange themselves into a hollow sphere known as the blastula, with a fluid-filled cavity called the blastocoel.

- This stage sets the foundation for further differentiation and development of specialized tissues and organs in the embryo.

2. The body axis of the embryo appears.

3. Sperm travel to the oviduct.

4. The fetus’ circulatory system begins to mature.

- The appearance of the body axis occurs during gastrulation itself, not immediately after.

- Sperm travel to the oviduct for fertilization, which typically occurs before gastrulation.

- The maturation of the fetus' circulatory system happens later in embryonic development, not immediately after gastrulation.

What is the sac around the heart that secretes a lubricating fluid to prevent frictions from the movement of the heart?

Answers

The sac around the heart that secretes a lubricating fluid to prevent frictions from the movement of the heart is the Pericardium.

The pericardium is the membrane that encloses the heart. It helps protect the heart from infections and also prevents the heart from filling with too much blood.

ANSWER: Pericardium

Hope this helps! :)

What do you call it when scientists change the genes that line a dna molecule?

Answers

I think it is called genetic engineering. It is also called genetic modification, it is the modification of an organism's genetic composition by artificial means, often involving the transfer of specific traits or genes, from one organism into a plant or animal of an entirely different species.   An example of genetic engineering is cloning which involves producing a genetically identical copy of an organism.

Howe's six dimensions of professional codes of morality include?

Answers

I think they include knowledge and courage. The six dimension of professional behavior are; courtesy and respect, appearance and appeal, tolerance and tact, honesty and ethics, reliability and responsibility, diligence and collegiality.

What causes the speed of seismic waves to change

Answers

Seismic waves change speed as they travel through Earth because of the four different layers. The layers differ, changing from a thin crust, to a rocky mantle, a liquid outer core, and finally a solid metallic core. Each of the layers affect the speed of seismic waves due to the differences in their makeup
 hope this helps.

Final answer:

Seismic waves experience changes in speed depending on the material they pass through, with denser and more rigid materials causing faster travel and partially melted or liquid materials slowing or stopping certain waves. Variations in rock density, elasticity, and state due to depth-induced compression and temperature changes are also key factors.

Explanation:

The speed of seismic waves changes as they travel through different materials due to variations in density, elasticity, and state of the materials. Factors such as the level of rock compression, which increases with depth, affect velocity; hence, waves move faster through denser and more rigid materials. Refraction also plays a role, as the increase in density and seismic velocity with depth causes seismic rays to curve and bend toward the earth's surface. This effect is seen in the mantle, where seismic waves travel faster through cooler, denser rocks than through warmer, less dense rocks.

Furthermore, the physical state of the material significantly influences wave speed. For instance, when seismic waves encounter partially melted or liquid regions, P-waves are slowed significantly and S-waves are stopped altogether. Therefore, seismic wave speed can be a powerful tool for geologists to understand Earth's interior structure, using changes in wave speed to infer the presence of different materials and states within the planet.

Which statement is true of the climate of a desert?
A) Sunset is expected at 8:07 PM.
B) The temperature dropped to 54° last night.
C) The forecast calls for no rain in the next ten days.
D) The average rainfall is less than 6 inches per year.

Answers

I would say answer D) The average rainfall is less than 6 inches per year because the definition of a desert is less than 6 inches of rain fall per year hope this helps!

The brain grows the most rapidly during the first ________ years of life

Answers

The brain grows the most rapidly during the first months and years of life. During first months and years rapid growth and refinement in axons, dendrites, and synapses occur, especially in the cortex. A child's brain undergoes an amazing period of development from birth to to three- producing more than a million neural connections each second. The development of the brain is influenced by many factors, including a child's relationships, experiences and environment.
Final answer:

The brain grows the most rapidly during the first few years of life. Research suggests that neural connections and pathways occur during this period of rapid growth. The brain becomes more complex, efficient, and functional during childhood and adolescence.

Explanation:

The brain grows the most rapidly during the first few years of life. Research suggests that the majority of neural connections and pathways occur during this period of rapid growth, known as blooming. This growth is followed by a period of pruning, where neural connections are reduced to make the brain function more efficiently. By the age of six, the brain has already attained about 90 percent of its adult size. During the first few years of life, the frontal lobes, which are associated with planning, reasoning, memory, and impulse control, grow rapidly. Overall, the brain becomes more complex, efficient, and functional during childhood and adolescence.

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