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kow [346]
3 years ago
10

what cell structure is largely responsible for controlling the entry and exit of substances into or out of the cell?​

Biology
1 answer:
ehidna [41]3 years ago
7 0

Answer:

plasma membrane

Explanation:

The plasma membrane is also known as the cell membrane. It is the boundary between the internal components of a cell and its external surroundings. It controls the entry and exit of substances into or out of the cell and thus, facilitates the exchange of substances between the cells and their external environment.

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Which of the following is a nonrenewable resource?
marusya05 [52]

Answer;

Gold


Gold is a non renewable resource.


Explanation;

Non renewable resources are those resources of economic value that can not be readily replaced by natural means on a level that is equivalent to its consumption.

Examples of non renewable resources include; fossil fuels such as oil, natural gas and coal; because their source is not sustainable.

5 0
3 years ago
Read 2 more answers
Which of these diseases does NOT require the introduction of foreign nucleic acid?
OverLord2011 [107]

Answer: Kuru

Explanation:

Kuru are transmitted by prion. This diseases are untreatable and ultimately fatal.

Prions are infectious proteinaceous particle that are neither virus nor do they contain nucleic acid.

They are transmitted by ingestion of the infected nervous system tissues.They are normally found in the healthy brain tissues if this protein is mis-folded into denatured form it can cause disease.

6 0
3 years ago
The following are the steps for B-cell activation. The steps are in an incorrect order.
Nataly_w [17]

Answer:

4. B cells become activated by interacting with helper T cells.  

1. B cells display antigens in MHC class II receptors on the cell surface.  

2. Antibodies released by plasma cells bind to the antigen so they will be destroyed by other cells of the immune system.

3.B cells rearrange their DNA to create a unique B-cell receptor.  

5. B cells undergo clonal expansion.

6. B cells digest antigens that bind to the antibodies on their surface.

Explanation:

B-cells get activated by interacting with helper T cells when they bind to the antigen to receptors i.e (MHC class II receptors on the cell surface) on the surface of the cell. Series of activities such as release by plasma cells which cause rearrangement of B cells causes the cell to divide and proliferate. The process through which daughter cells arise from a parent cell called clonal expansion.

4 0
3 years ago
What does the biosphere contain?
Vika [28.1K]
<span>living things ................</span>
5 0
3 years ago
ASAP PLEASE HELP!!!!
MissTica

Answer:

B !

Explanation:

I'm basing this off of a lesson I took two years ago, but the answer is B! The interior of Earth is rumored to be filled with magma as a way to have convection currents in itself, and to move the tectonic plates/ create the tectonic plates, if I remember correctly.

If i'm wrong I can still prove why it's not the other choices.

It's not A becuase when rock gets hotter, it rises, and when it cools, it sinks.

it's not C becuase it said "interior of the planet", which it may be referencing somewhere having to do to below the crust. as well, you need to cool rocks as to make it solid, not heated up rocks. but even then, mountains are made by the plates.

it's not D becuase glaciers are affected by climate change and occurrences the biosphere, not the interior of the planet.

4 0
3 years ago
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