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qaws [65]
3 years ago
10

Plasma membranes are selectively permeable. This means that

Biology
1 answer:
kenny6666 [7]3 years ago
8 0

Answer: ONLY CERTAIN SUBSTANCES CAN PASS THROUGH IT

Explanation:

1 only gases and water can pass through it.

2 substances need permission to pass through it.

3 only certain substances can pass through it.

4 substances need carrier molecules to pass through it.

5 ATP is always needed to move molecules across the plasma membrane.

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A DNA strand has mutated! What type of mutation has occured?
velikii [3]

Answer:

b

Explanation:

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3 years ago
Imagine a population of rabbits with fur color that ranges from black to white. If this population were put in an area that has
Molodets [167]

The correct answer is option (C) Gray rabbits would be eliminated by predators.

Camouflage is an adaptation by organisms allowing them to blend with the environment. This helps them in surviving or escaping from their predators. It can be throught coloration or developing a particular pattern or mimicry.

The example given above is a type of camouflage through concealing coloration. Concealing coloration includes having a fixed camouflage and changing the camouflage depending on the environment. Grey rabbits cannot exhibit camouflage as the backgroud is dark rocks and light stones. As a result, these rabbits are clearly visible to the predators and get elimiated by them.



4 0
3 years ago
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Harlamova29_29 [7]

Answer:

1.b

2.a

3.c

QUESTION #6: A

Explanation:

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5 0
3 years ago
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Adaptive immunity comprises two branches: humoral immunity and cellular immunity. What are the characteristics of each of the tw
kotegsom [21]

Answer:

Adaptive or acquired immunity is that we acquire throughout our lives through vaccines (active), breast milk (passive) or injection of specific artificial or natural antibodies to a certain pathogen (passive).

The two great arms of this immunity are the humoral and the cellular.

The humoral refers to the cytokines and immunomodulatory molecules that are responsible for transmitting fundamental messages between defense cells in order to coordinate the destruction of the pathogen between them.

Instead, cellular immunity speaks about cell lineage such as b, t, tcd4 lymphocytes, natural killers, plasmacytes, etc.

It can be said that the humoral factor is the one that coordinates the pathways and the relationships between the cells of the acquired immunity, both are important because the two need each other for adaptive immunity to work.

Explanation:

Examples of the humoral factor: pro and anti inflammatory cytokines, interleukins, complement chain, antibodies, TNF alpha, beta, etc.

Examples of cellular factor: plasmacyst, b lymphocyte, t lymphocyte, NT lymphocyte

6 0
2 years ago
List some common adaptations in organisms
bonufazy [111]
Some common adaptation in organisms would be:

Behavioral adaptation.
Biological adaptation.
Natural selection.

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2 years ago
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