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ASHA 777 [7]
3 years ago
12

How would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater

Biology
1 answer:
Sveta_85 [38]3 years ago
8 0

Answer: Contractile vacuole of amoeba will shrink/contract when the organism is placed in sea water.

Contractile vacuole is a subcellular structure ( mainly found in protists) that is involved in the regulation of water quantity inside a cell.

As we know that water always flow from a hypotonic ( where solute concentration is less) to a hypertonic ( where solute concentration is more) solution. Sea water is a hypertonic solution as the concentration of salt is very high. Therefore, in this case, water will flow from contractile vacuole to outside of the organism.

Thus, contractile vacuole of amoeba will contract as it will lose water when placed in sea water.

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As a long bone develops, the point where osteoblasts first replace calcified cartilage with spongy bone becomes the ________, fr
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Answer:

A) primary ossification center

Explanation:

Endochondral ossification refers to the gradual replacement of a cartilage model with a bone. The primary ossification center represents the region where bone tissue gradually replaces most of the cartilage model. The deposition of the bone extracellular matrix over the remnants of calcified cartilage is done by osteoblasts. It results in the formation of spongy bone trabeculae. Primary ossification spreads from the central location toward both ends of the cartilage model.

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3 years ago
Why doesn't male pattern baldness affect hair on the rest of the body like arms and legs?
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Answer:

Male tends to grow excess hair in most places, while women don't. Because of this reason, when a male loses his head hair hair so strong will keep on growing on the arms and legs that you cannot get rid of it.

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6 0
3 years ago
A researcher is studying the external plates of marine dinoflagellates to improve the taxonomy of these members of the phytoplan
Vera_Pavlovna [14]

Answer:

The correct answer is - scanning electron microscope.

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SEM or a scanning electron microscope is that produces an image by an electron beam over the sample surface to scan. The electrons of the beam interact with the sample producing various signals that allow providing information about the composition and topography of the individual sample. The magnification of the SEM is in between 20X to 30000X  

Thus, the correct answer is - scanning electron microscope.

6 0
3 years ago
Benzodiazepines are preferred over barbiturates to treat anxiety disorders because ______.
sineoko [7]

Benzodiazepine drugs include diazepam and alprazolam, are commonly prescribed for anxiety disorders because they work – as simple as that. Benzodiazepines relieves symptoms of anxiety, allowing the patient to rest or think more clearly. They are sometimes given before surgery so the patient will stay calm. Benzodiazepines exert effect in short period of time, and so works better than barbiturates. Such drugs should be used only for 1 to 2 weeks, or on as needed basis. Treating anxiety should be based on psychological approach rather than rely on drugs.

5 0
3 years ago
Fifty years ago, bed bugs were nearly eliminated in the United States by using of pesticides like DDT. Today bed bugs are back i
KATRIN_1 [288]

Answer: B

Explanation: We cannot assume that bedbugs can sense another bedbugs genetic mutations, or plan a mutation. Mutating of genetics is random, and is apart of life for all species.

3 0
2 years ago
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