Biology High School

True or false abstinence is the only way to prevent pregnancy 100%.

Answers

Answer 1
false there is many ways to prevent pregnancy 100%
Answer 2

Answer:

True

A p e x i got this question correct

Related Questions

Some foods may test positive for glucose, but do not taste sweet. what is a possible explanation?

Answers

Glucose is a sugar but it is not that sweet in tasting. If food does not taste sweet, it does not mean that it negative for glucose. Glucose positive test means the breakdown of the metabolic constituents of the food into carbs like glucose, fructose into blood stream, which then act as the energy source of the cells. Fructose and sucrose are what we perceive as sweet.

Final answer:

Even though glucose is present in many foods, it does not always result in a sweet taste because of the complex process involved in taste perception. Taste is influenced by various receptors activated by different components present in food, and how molecules bind to these receptors. Glucose detection is not always related to taste but also to medical monitoring.

Explanation:

The taste we perceive of a certain food is a complex interplay of a variety of different taste receptors in our mouth. Glucose can be found in many foods, but it does not always result in a sweet taste because taste is determined by a complex process involving G protein-coupled receptors on gustatory cells. While glucose can activate sweet receptors, other components in the food may also activate other receptors, such as those for bitter or sour tastes, altering the overall taste perception of the food.

Apart from this, different molecules bind to the G protein-coupled receptors differently, and this can also influence the overall taste perceived. For example, artificial sweeteners like aspartame, saccharine, or sucralose may actually taste sweeter than glucose because they bind to these receptors differently.

Lastly, it's important to note that not all glucose detection is related to taste. Glucose is also often detected for medical reasons, such as in people with diabetes who use test strips to monitor their glucose levels.

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To find the distance to an earthquake’s epicenter, scientists _______________________________.
analyze the arrival times of the P waves and surface waves

analyze the arrival times of the P waves and S waves

analyze the arrival times of the surface waves and S waves

analyze the arrival times of the Love waves and Rayleigh waves

Answers

The answer is B. analyze the arrival times of the P waves and S waves.

The approximate transfer of energy from one trophic level to the next higher trophic level is ________.

Answers

Oxygen is the next higher tropic level

The proximal end of the ulna illustrates the relationship of form and function. the rounded trochlear notch articulates with the hourglass shape of the trochlea. this forms a joint that allows for ________. the hinge like motion of the forearm the rotational motion of the forearm the curling of the fingers the hyper extension of the forearm

Answers

I believe that this forms a joint that allows for hinge like motion of the forearm. 
The ulna extends through the forearm from the elbow to the wrist, narrowing significantly towards its distal end. At the proximal ends it forms the elbow joint with the humerus of the upper arm and the radius of the forearm. The ulna then extends past the humerus to form the tip of the elbow (olecranon). The hinge like motion of the elbow joint places the point of the olecranon well under the middle of the upper arm.

Answer:

Option A, The hinge like motion of the forearm

Explanation:

A hinge joint  allows for two motions at a time

a) Flexion - The bending motion

b) Extension - The strengthening motion of arm bones

At the  proximal end , the Ulna forms a joint with the humerus  and radius of forearm. The Ulna extends to form olecranon (the tip of the elbow) Both Ulna and radius bones are attached with an interosseous membrane that causes movement just like a hinge joint.

Option A is correct

A child that is not stimulated with a normal environment is likely to show ____.​

Answers

The child have fewer neural synapses than a stimulated child. In our nervous system, synapses are structures that allows neurons to conduct electrical impulse from each other. Synapses transmits information via electrical or chemical means. In chemical synapses, the electrical activity is converted into the release of neurotransmitter that binds in to the receptors that can be found in the post synaptic membrane.In Electrical impulse, the pre and post synaptic cell membranes are connected by synaptic clefts. This allow the passage of  electrical current causing changes in the voltage in the presynaptic cell and induce voltage change in the post synaptic area.

Is a cells main function is to produce proteins to be excreted, such as on the pancreas, which organelles would you expect to be larger or more prevalent? Why?

Answers

Protein synthesis occurs in the cytoplasm, specifically in the ribosomes. Proteins that are meant to be excreted, such as in the pancreas, are produced in the rough endoplasmic reticulum which is a membrane studded with ribosomes. In organs that primarily function to produce and secrete proteins, there will be a larger rough endoplasmic reticulum with more ribosomes.

Skin is able to prevent most microorganisms from entering the body by

Answers

The structure of the skin is an effective barrier against bacteria. The multiple layers of epidermis, while can be invaded by foreign organisms, has a high turnover rate which means it is constantly shedding, therefore even the bacteria is shed protecting the body. Lastly, the skin's lipids maintain an acidic pH which slows and stops growth and replication of bacteria.

Besides lymph nodes, where would you expect to find proliferating (dividing) b cells?

Answers

We can expect to find dividing and maturing B cells, aside from the lymph nodes, is in the spleen. The spleen is one of the major lymphoid tissues (i.e. lymph nodes, thymus, mucosa associated lymphoid tissue, etc) where lymphoid cells proliferate. The major cell from the lymphoid lineage that proliferates in the spleen are the B cells.

What role does the overproduction of organisms play in natural selection?

Answers

They could look for similarities in the DNA or protein structuresof the organisms and similarities in early development

Which three human activities lead to a loss of terrestrial habitat? a.conservation b.farming c.deforestation d.construction

Answers

The answers would be b.farming c.deforestation and d.construction!

Conservation is the act of trying to preserve nature! Quite the opposite of the question!
The appropriate answers are b. farming, c. deforestation and d. construction. Deforestation is the widespread removal of trees from forests. Deforestation destroys the habitats of thousands of species, especially regions such as the Amazon.
Large scale construction can lead to the destruction of habitats as the original shape of the land is altered. This alteration almost always disrupts habitats.
Improper farming techniques can lead to deforestation and soil erosion; both of which disrupts habitats.

How many synapses are crossed in a single reflex arc during a muscle stretch reflex?

Answers

One synapse. In stretch reflex muscle contraction occurs in response to the stretching within muscle. Monosynaptic reflex is the one that provide the action for the skeletal muscles. If the muscles lengthens, the activity of the nerve of muscle spindle increases. This will lead into an increase in alpha motor neuron functions. This will result into muscle fibers to contratc and counters the stretch.  Gamma neurons are the one that controls the sensitivity of the stretch reflex.
Final answer:

In a typical muscle stretch reflex, two synapses are crossed: one between the sensory neuron and the spinal cord and another between the spinal cord and the motor neuron.

Explanation:

In the case of a muscle stretch reflex, typically only two synapses are crossed. For example, when a muscle is stretched, signals are sent to the spinal cord via sensory neurons (first synapse). In the spinal cord, these sensory neurons synapse with motor neurons (second synapse) which then send signals back to the muscle causing it to contract and resist the stretch.

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What is the main difference between an autotroph and a heterotroph?
A.
A heterotroph only consumes plant matter whereas an autotroph eats both plants and animals.

B.
A heterotroph is able to produce its own food whereas an autotroph must consume other organisms for energy.

C.
An autotroph is able to produce its own food whereas a heterotroph must consume other organisms for energy.

D.
An autotroph only consumes plant matter whereas a heterotroph eats both plants and animals.

Answers

I believe it would be C.

Hi:) i think the answer is C

Which properly traces the movement of chromosomes during mitosis?

Answers

The cellular structure which traces the movement of chromosomes during mitosis is the centrioles. Centrioles are mainly constructed of microtubules and are responsible for directing the movement of chromosomes during mitosis.
Mitosis is the process of the cell cycle where one cell splits its duplicated genetic material into two identical cells. Centrioles are part of the mitotic spindle which is the structure that organizes and moves the chromosomes into these two daughter cells.
Final answer:

Mitosis consists of sequential stages starting with prophase and ending with cytokinesis, during which the chromosomes condense, attach to spindle fibers, align at the metaphase plate, are pulled apart during anaphase, and are separated into two new nuclei in telophase.

Explanation:

To properly trace the movement of chromosomes during mitosis, one must understand the sequential stages involved in this process. Mitosis is a critical aspect of cell division that ensures each daughter cell receives an exact copy of the parent cell's chromosomes.

Prophase: Chromosomes condense and become visible. The mitotic spindle begins to form, but the nuclear envelope is still intact.Prometaphase: The nuclear envelope breaks down, allowing spindle fibers to attach to kinetochores on the chromosomes.Metaphase: Chromosomes align at the metaphase plate, with sister chromatids facing opposite poles.Anaphase: Cohesion proteins dissolve, and sister chromatids are pulled apart by the spindle fibers toward opposite poles.Telophase: Nuclear membranes start to reform around separated sister chromatids, now individual chromosomes, at the poles of the cell.Cytokinesis: The cytoplasm divides, creating two daughter cells, each with a complete set of chromosomes.

Which of the following weather conditions would result in the greatest rate of evaporation from the Earth's surface?

Answers

what are the options to choose the answer from?
 dry and hot weather would result in a greatest rate of evaporation

PLEASE HELP!!!

Number 1.

Which statement about this diagram is correct?

A. Molecule 1 is RNA, which contains thymine.

B. Molecule 2 is DNA, which can bond with another DNA Molecule.

C. Molecule 1 is DNA, which is a double helix.

D. Molecule 2 is RNA, and it is the only nucleic acid that contains four types of bases.




QUESTION 2!

Which statement explains the overall function of the two molecules in the diagram?

A. They provide an organism with usable energy in the form of ATP.

B. They make up an organism's in physical structure.

C. They carry information about how an organism is put together and maintained.

D. They store excess carbohydrates for later use.



Answers

A.) Molecule 1 is DNA because it is a double helix.  

B. They make up an organism's in physical structure.

why is the moon visible?

A) It gives off light
B) Earth Lights it up
C) it reflects sunlight
D) it is on fire

Answers

The moon is visible because  it reflects sunlight.

What is the moon?

The moon is part of the celestial bodies which is known for being a high reflecting surface.

Since the moon is a non luminous object but is able to reflect the light that is incident on it, it then follows that  the moon is visible because  it reflects sunlight.

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If an organism has 6 haploid chromosomes, how many chromosomes are present? 6 12

Answers

the Haploid number is half (haploid cells are sex cells egg and sperm they have half as many chromosomes as the diploid cells which are normal cells ) of the chromosomes so that would be 12. To clarify that if a organism has 12 chromosomes and reproduce sexually it takes two
parents each contributing ether a egg or sperm each egg or sperm contains half of the genetic
material 


Your answer would be (6)




Hope this helps.

The number of chromosomes in a haploid cell, which includes an egg and sperm, is half that of a diploid cell, or a normal cell. Therefore, a haploid cell would have 12 chromosomes.

What is Haploid chromosomes?

A cell with a single set of chromosomes is called haploid. The number of chromosomes in sperm or egg cells, often known as gametes, is also referred to as haploid.

In humans, gametes are haploid cells with 23 chromosomes—one of each chromosomal pair found in diplod cells—and are hence haploid. The haploid number, commonly known as n, is used to indicate the number of chromosomes in a single pair. n = 23 for people.

Half of the chromosomes found in somatic cells, or the body's typical diploid cells, are found in gametes. Meiosis, a type of cell division that cuts the number of chromosomes in a parent diploid cell in half, produces haploid gametes.

Therefore, The number of chromosomes in a haploid cell, which includes an egg and sperm, is half that of a diploid cell, or a normal cell. Therefore, a haploid cell would have 12 chromosomes.

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Where does the calvin cycle (i.e.the dark reactions of photosynthesis) take place? select one:
a. stroma of the chloroplast
b. outer membrane of the chloroplast
c. thylakoid membrane
d. interior of the thylakoid (thylakoid space)?

Answers

A) stroma of chloroplast

While reviewing the medical reports in an acute care setting, the nurse finds that the client is at risk for kidney damage and requests the healthcare provider to increase the intravenous fluid rate as a priority nursing intervention. which finding supports the nurse's conclusion?

Answers

The correct answer is the urine output is 25 mL/hr.
The urine output is the amount of urine produced by a person hourly. The normal range for urine output is 800 to 2000 mL per day, meaning that the minimum rate of urine output should be approximately 30 mL/hr. Estimating the urine output can help monitor the kidney function and the levels of the body's hydration. Serious health problems could cause a decreased urine output, such as decreased blood supply to the kidneys or bladder and prostate problems. The patient has lower rate than normal and his/her fluid intake should be increased. 

You have figured out how pulmonary arteriole vasoconstriction could lead to high vascular resistance and therefore high blood pressure in the pulmonary circuit. this high resistance is going to make it harder for the heart to push blood through the vessels, overworking the heart and leading to heart failure. which side of the heart is most likely to be overworked?

Answers

The answer would be the right side.

Blood to lungs is pumped by the right ventricle. When there is increased vascular resistance in the lungs, the pressure will be increased called pulmonary hypertension. This will cause the right ventricle need to exert more force than usual.
Left ventricle would be responsible for the blood flow to the body.

Choose all the answers that apply. The mantle _____. is the thinnest layer is the thickest layer is the hottest layer is made of solid rock sometimes breaks through the crust

Answers

the thickest layer, the hottest layer

Answer:

the thickest layer, the hottest layer

Explanation:

A scientist wants to prevent a culture of live cells from producing a particular protein. Which of the following will the scientist most likely modify to prevent the production of the protein?

A: the DNA in the nucleus
B: an enzyme in the lysosomes
C: the polysaccharides in the cytoplasm
D: a phospholipid in the plasma membrane

Answers

The answer is the DNA in the nucleus. 

A protein is formed by the DNA going through the processes of transcription and translation. All the information needed to produce a specific protein is stored in the DNA region which corresponds to that specific protein. When there is a need for a specific protein, the DNA is transcribed into an RNA strand, and the RNA strand is then translated into a chain of amino acids that form the structure of the protein. 

A lysosome is an organelle which contains degradative enzymes and has a role in degrading proteins that have been used, or proteins that are not needed at a specific time. The polysaccharides are a structural part of the cytoplasm and they don't have a big role in the formation of proteins, and phospholipids in the plasma membrane are a structural part that keeps the shape of the membrane and they have a role in the transport of proteins.
 So to answer your question, if a scientist were to prevent the production of a specific protein, they would most likely modify the DNA segment in the nucleus of the cell that corresponds to that protein, so that when the cells start to transcribe that part of the DNA, they fail.

32. Explain the relationship between the central nervous system and the peripheral nervous system. How do
they work together to accomplish a task? (4 points)

Answers

Nerves from the peripheral nervous system that leave the brain and spinal cord travel throughout the body. The peripheral nervous system job is to send information from the body's sensory receptors to the central nervous system quickly.

The nervous system develops throughout the human body and includes very different elements in their forms and functions. It is divided into two complementary systems, the Peripheral Nervous System (PNS) and the Central Nervous System (CNS).

The SNP includes all the nerve tissue that runs through the body. It has a dual function: to receive information by sensory sensors and transmit them to the CNS, and to activate motor functions controlled by the CNS. It consists of two parts, that somatic, activating the skeletal muscles and that, autonomous, attached to the viscera.

The CNS is the brain and spinal cord. It is the center of information processing.

Describe the role of bone morrow in the immune system. Explain why someone who has a genetic disorder that does not allow their bone marrow to do its job may be helped by a bone marrow transplant.


Answers

 Bone marrow produces red blood cells, white blood cells, and platelets. The white blood cells (also called leukocytes) that our bone marrow produces are used to fight off diseases, and the platelets rush to a wound to form a layer over it, similar to a plate, to clot the blood and prevent bleeding. If your bone marrow dies or fails, your red blood cell count will dramatically decrease. A low blood cell count is called cytopenia. Someone who has a genetic bone marrow disease may be helped by a bone marrow transplant from a matching relative or donor. Before a transplant you get chemotherapy with or without radiation to kill off diseased red blood cells. During a bone marrow transplant you get injected with new, healthy red blood cells that make their way to your bone marrow to further grow and develop.

Match each description below with the cell type it characterizes. cell types may be used more than once or not at all.
a. melanocyte
b. keratinocyte
c. fibroblast major cell type found in the dermis of the skin; its primary function is to secrete extracellular matrix.

Answers

Major cell type found in the dermis of the skin; its primary function is to secrete extracellular matrix.C. Fibroblast.
Major cell type found in the epidermis of the skin whose primary function is production of pigment.a. Melanocyte.
Major cell type found in the epidermis of the skin; its primary function is to protect underlying tissues and organs.b. keratinocyte.

Which of these features would you expect to see on a homo heidelbergensis skull?

Answers

This question is unfortunately incomplete. However, the general skull features of Homo heidelbergensis include large brow ridges, a broad, sloping forehead and a rear skull wall that is vertical rather than rounded or sloping.

The effects of the sympathetic nervous system are divergent, meaning that a single stimulus can have an effect on a large number of targets. in other words, when the sns is activated, all of the organs it innervates are stimulated. this does not occur in the parasympathetic system. why?

Answers

The sympathetic ganglia spreads the stimulus to all postganglionic sympathetic neurons.

He primary function of the rectum is to ____.
a. ​store digestive hormones until they are needed
b. ​absorb excess water from waste materials
c. ​store waste materials prior to evacuation
d. ​absorb minerals from waste materials
e. ​control functioning of the colon

Answers

The primary function of the rectum is to ​store waste materials prior to evacuation.

How can humans affect the rate of water erosion?

Answers

by littering and also by fumes from cars and ect.

What is mitosis, HURRY PLEASE

Answers

In cell biology, mitosis is a part of the cell cycle when replicated chromosomes are separated into two new nuclei.
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