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slavikrds [6]
2 years ago
10

Which statement about the cell membrane is true?

Biology
2 answers:
Inga [223]2 years ago
7 0
It prevents harmful substances from entering a cell. I uses carrier proteins to do so.
saul85 [17]2 years ago
7 0

The answer is D, It prevents harmful substances from entering the cell. Hope this helps!

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Marcie is writing an article on the Big Bang Theory. What fact should she include in it? A. The universe started expanding after
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Answer:

C. The universe coalesced into one solar system after the Big Bang.

Explanation:

This is true because, since she is writing about Big Bang theory, she would have to include how the universe was able to expand to one solar system made up of different planetary bodies. This explanation would help someone reading her writeup to understand what the Big Bang theory is all about.

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2 years ago
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Which two parts of a plant reproduce, or make, new seeds?
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The stem and the middle of the peatals
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What causes 37% of all pollution?<br> oil <br> water dumping <br> nuclear waste <br> landfills
OverLord2011 [107]

Answer:

nuclear waste

Explanation:

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How to find a dna sequence in another organism"?
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3 0
3 years ago
In a certain plant, tall stems (t) are dominant to short stems (t). a farmer crosses a short-stemmed plant with a heterozygous l
melisa1 [442]

The answers would be:

Genotype                Phenotype

     Tt                      Tall stemmed

     tt                       Short stemmed

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2  or 1:1  

<u />

<u>You can read on to see how this was done:</u>

Tall stems (T) are dominant to short stems (t).

First figure out the genotypes of the parents. We have a short-stemmed plant and a heterozygous long-stemmed plant cross.

For short stem to occur, you need 2 pairs of short alleles. So the first parent would have a genotype of tt.

Heterozygous long-stemmed means that the parent has one of each allele. So the genotype of the second parent would be, Tt.

Now we can make our Punnett Square.

tt x Tt

<u>       t        t  </u>

<u>T |  Tt  |   Tt</u>

<u>t  |   tt  |   tt</u>

Let's list down the genotypes and phenotypic results.

Genotype        no.         Phenotype

     Tt                 2           Tall stemmed

     tt                  2           Short stemmed

So from that we can answer the other questions:

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2  or 1:1  

8 0
3 years ago
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