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Mashcka [7]
3 years ago
8

Which best describes how mRNA is produced in a cell

Biology
2 answers:
bogdanovich [222]3 years ago
8 0

Answer:

A. mRNA is made by RNA polymerase, using DNA as a template

Explanation:

An mRNA molecule is synthesized by RNA polymerase which uses DNA template to do so.  In eukaryotes, mRNA is specifically synthesized by RNA ploymerase II with the help of sigma factor and various transcription factors while tRNA and rRNA are synthesized by RNA polymerase III & I respectively. But in contrast to eukaryotes, in prokaryotes a single RNA ploymerase synthesizes mRNA as well as tRNA and rRNA with the help of sigma factor.

Alex787 [66]3 years ago
6 0
A. mRNA is made by RNA polymerase, using DNA as a template.
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We are studying 3 strains of bacteria, with populations p1, p2, p3, in an environment with three food sources, A, B, C. In a day
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Answer:

The population of each bacteria in 1, 2, 3 are 12, 8, and 7 respectively.

Explanation:

From the given information:

For  food source A; we have:

3P₁ + P₂ + 2P₃ = 58    units of food A ---- (1)

For food source B; we have:

2P₁ + 4P₂ + 2P₃ = 70   units of food B  ---- (2)

For food source C; we have:

P₁ + P₂  = 20   units of food C    ----- (3)

From equation (1) and (2); we have:

3P₁ + P₂ + 2P₃ = 58

2P₁ + 4P₂ + 2P₃ = 70

By elimination method

 3P₁ + P₂ + 2P₃ = 58

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 2P₁ + 4P₂ + 2P₃ = 70

<u>                                       </u>

<u> P₁  -   3P₂   + 0    = - 12    </u>

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P₁ + P₂  = 20

-12 + 3P₂ + P₂  = 20

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4P₂ = 32

P₂ = 32/4

P₂ = 8

From equation (3) again;

P₁ + P₂  = 20

P₁ + 8 = 20

P₁  = 20 - 8

P₁  = 12

To find P₃;  replace the value of P₁ and P₂ into (1)

3P₁ + P₂ + 2P₃ = 58

3(12) + 8 + 2P₃ = 58

36 + 8 + 2P₃ = 58

2P₃ = 58 - 36 -8

2P₃ = 14

P₃ = 14/2

P₃ =  7

Thus, the population of each bacteria in 1, 2, 3 are 12, 8, and 7 respectively.

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3 years ago
Which of the following environmental changes is most difficult to survive?
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Explanation:

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