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Murljashka [212]
3 years ago
9

Why some molecules can pass through a certain membrane,but other molecules can not?

Biology
1 answer:
fiasKO [112]3 years ago
4 0
It's depends on the size of molecule. big ones cannot pass the membrane while smaller molecules can.

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In light of the all or none law of muscle contraction, how can you explain the graded response?
Andrews [41]
<span>In the "all or none" law of muscle contraction, it states that when the stimulus applied exceeds threshold then the the nerve sending signals to a few muscle fibers will give a complete response; contraction. Graded response is dependent on how many motor units have been recruited. The more motor units, the greater the force in the contraction.</span>
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Why do fungi release enzymes from there tips?​
lapo4ka [179]

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They absorb the food molecules that result from the external digestion.

Explanation:

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2 years ago
Dr. Paul Ehrlich observed that the differential stain developed by Dr. Gram suggested bacteria could be killed differentially by
Alex787 [66]

Answer:

The correct answer is Glycocalyx, ribosome and cell wall.

Explanation:

Glycocalyx is mainly found in bacteria that makes a protective covering outside the cell wall in the form of capsule of bacteria and provide protection to bacteria from host immune cell.  

Bacterial ribosomes are different from human ribosomes. Bacteria contain 70s ribosome while humans contain 80s ribosome so ribosomes are potential targets for many drugs present today.

Bacterial cell contain cell wall which is made up of peptidoglycan or lipopolysaccharide but human cell does not contain a cell wall, therefore, many drugs are designed to destroy cell wall of bacteria like penicillin.

So glycocalyx, ribosomes, and cell wall can be potential targets for Dr. Ehrlich's "magic bullets" due to significant difference or absence from humans.

4 0
3 years ago
Which of the following Represents an ecological niche
Black_prince [1.1K]
No answer can be given because there is not enough information in the question. 
8 0
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3. List three other types of evidence that plants existed in Antarctica. (besides that there were plant fossils found)
GalinKa [24]

The three evidence that support the existence of plants on Antarctica are:

- Climate;

- Pollen;

- Herbivorous animals;

Apart from the plant fossils found on Antarctica, there are few other evidence that suggest that plants existed in the past on the now frozen continent. Some of those evidence for the existence of plants on Antarctica are the pollen found in the rocks and fossils of organisms, the climate records, as well as the herbivorous animals.

The pollen is only released by the plants, thus that is a sure indicator that plants were occupying this part of the world.

The climate records on Antarctica that can be seen in the rock layers, suggest that for most of its existence, Antarctica had a warm and wet climate, which is perfect conditions for the plants to thrive.

The herbivorous animals are feeding themselves on plant material, so since there's fossils of herbivores in Antarctica, it for sure is an evidence that there were plants existing in order for them to feed and be able to live in there.

3 0
3 years ago
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