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yulyashka [42]
3 years ago
8

Consider the life cycle of a cell. when the memory cells of the immune system are not activated or responding to a pathogen expo

sure, what phase of the cell cycle are they likely in? justify your reasoning
Biology
2 answers:
Solnce55 [7]3 years ago
7 0
Bruh i got the same question and this website made it look like there was an answer so i made an account... and there's no answer. Thanks brainly, way to scam a struggling student.
dezoksy [38]3 years ago
3 0

Ans.

Memory cells of immune system are present in G0 phase, in which these cells are not activated or responding for a pathogen.

The cell-cycle is defined as the series of events that lead to DNA duplication and division of a cell to form daughter cells. The cell cycle is divided into interphase and M phase.

The interphase includes gap 1 (G 1) phase, S or synthesis phase, and gap 2 (G 2) phase, while M phase includes karyokinesis and cytokinesis.

The cells after M phase either goes for next cell division or G1 phase or for G 0 (gap 0) phase. The G0 phase is resting phase, in which cells show a quiescent state.

As memory cells are present in resting phase, till the next exposure of same antigen, these cells are in G0 phase of cell cycle.

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3 0
3 years ago
_______ cause(s) populations to change over time.
vekshin1
The answer is B., Natural Selection.

Weather certainly doesn't change populations, and genes only caused individuals in a population to be slightly ( genetically-wise ) different from the others. It does cause change, but not change in the whole population over time.
Natural disasters don't change the populations over time either. Natural disasters only caused change in their environment, at most.

So, the only answer left is natural selection, and it makes sense too! 
Natural selection is the process where the individuals with better traits suited to survive in that specific environment live on and give those good traits to their offspring.
The individuals with less suited traits to survive will die out, and will not be given an opportunity to reproduce and pass on their less suited traits, so over time, the population will increase of individuals with better suited traits to survive and the individuals with less suited traits will eventually die out, therefore making the entire population change.

Hope I helped you!
3 0
3 years ago
Which image represents cytokinesis in a plant cell?​
Artemon [7]

Answer:

D

Explanation:

8 0
2 years ago
Read 2 more answers
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