BIOLOGY HIGH SCHOOL

How would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater?with more contractions
with fewer contractions
the contractions would suddenly cease
with the same frequency of contractions

Answers

Answer 1
Answer:

Correct answer: B). With fewer contractions


The main function of a contractile vacuole is to maintain the sufficient amount of water in the protoplasm of the cell. For the freshwater amoeba contractile vacuole is needed to pump water and maintain a osmoregulation.

But when it is kept in sea water, more contraction is required to expel the water out of the cell in order to make the environment inside amoeba same as of sea water.
Answer 2
Answer:

Answer:

B

Explanation:

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A 68-year-old woman who presents after a fall reports progressive difficulty climbing stairs for the past 3 months. She also feels a loss balance when rising from a chair. She has a 5-year history of diabetes mellitus for which she takes metformin. Examination demonstrates intact cranial nerve function; normal sensory examination except for mildly decreased touch and vibration in her toes, normal motor function except for 4+/5 deltoid power and 4+/5 hip power bilaterally, and an inability to stand on her toes. Deep tendon reflexes are 2+ but 1+ at the ankles; plantar responses are flexor; cerebellar function is normal except for mild difficulty with heel-knee-shin testing. She has difficulty rising from a chair without pushing up with her hands. These clinical findings are best explained by dysfunction in which of the following regions of the nervous system?A. anterior horn cellB. muscleC. nerve plexusD. peripheral nerveE. spinal cord

Answers

Answer:

spinal cord and nerve plexus

Explanation:

Faced with this clinical picture, we would be talking about the affection of the spinal cord and the peripheral nerves that sensually perceive the areas of the epithelium, that is, they give the sense of touch, since the patient is diabetic, it could be deduced that the microangiopathies that this generates Chronic disease over time, can affect the irrigation of certain areas and therefore their inventions, due to lack of supply of oxygen and nutrients.

Diabetics are at risk of affecting both upper and lower limbs, because over time they lose the vascularization and winterization of these areas, thus generating infections or pain imperceptible by the patient.

On the other hand then, it would be ideal to say that the spinal cord with the peripheral nerves that innervate the affected areas, and the cerebellum are affected by the lack of balance or spatial disposition of the patient in relation to their body size.

Predatory fish that swim in the water column, usually have what kind of coloration?disruptive
counter shading
cryptic
fusiform

Answers

The answer is counter shading.

Countershading is used by the predatory fishes. It is a form of camouflage in which the animal's pigmentation is darker on the upper side and lighter on the lower side of the body. It made the predators detection from the prey but counterbalancing the effects of self-shadowing. 

If the heart becomes damaged or weakened, how will this affect the body’s systems? A. The muscular system will strengthen the heart. B. Only the nervous system will be unable to function. C. The circulatory system will not function well, which will affect all other body systems. D. Only the circulatory and respiratory systems will be affected.

Answers

If the heart becomes damaged or weakened, then the circulatory system will not function well, which will affect all other body systems (Option C).

  • The heart is a fundamental organ that forms part ofthe circulatory system.

  • This system (circulatory system) consists of blood, blood vessels (i.e., veins, arteries, capillaries), and the heart, which work together to carry out oxygen and nutrients to all body cells.

  • The heart is an organ responsible for pumping blood through these vessels to all cells of the body.

In conclusion, if the heart becomes damaged or weakened, then the circulatory system will not function well, which will affect all other body systems (Option C).

Learn more in:

brainly.com/question/3305440
the correct answer is c.the circulatory system will not fuction well,which will affect all other body systems.

Which is an example of a spontaneous exergonic reaction?a. protein synthesis occurring in cells
b. marshmallows catching fire
c. photosynthesis

Answers

B.) Marshmallows catching fire. 

Inflammation, your skin, and macrophages are all part of the body's ___ immune system response to a pathogen. allergic general practiced specific

Answers

Inflammation, your skin, and macrophages are all part of the body's general immune system response to a pathogen. 
General or non-specific immune response include the cells and mechanisms for defending the host from infection, but those mechanisms are not long-lasting. It includes anatomical barriers (like skin or mucose membranes),recruitment of immune cells to sites of infection, removal of pathogens by white blood cells (like macrophages)…

Answer:

B)

general

Explanation:

just did the test on usatestprep

Glucose is classified as aa. polymer.
b. monomer.
c. disaccharide.
d. polysaccharide.
Why does changing the pH of a solution affect the ability of an enzyme to catalyze a chemical reaction?
a. It destroys the substrate.
b. It changes the shape of the protein.
c. It breaks the protein into its monomers.
d. It raises the temperature of the solution.

Answers

B-monomer I am not sure about the second one but i think it's C
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