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sergiy2304 [10]
3 years ago
9

Question 21

Biology
1 answer:
Nonamiya [84]3 years ago
7 0

Answer:

B

Explanation:

Hope this helps! Have a great rest of your day! ;)

(Also mark as brainliest please)

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E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA
White raven [17]

Answer:

Option (d).

Explanation:

DNA is the genetic material of all the organism except some viruses. DNA is composed of nitrogenous base, deoxyribose pentose sugar and the phosphate group.

DNA replicatese by semi-conservative mode of replication in which one the daughter DNA consists of one newly synthesized strand and one parental strand. This mode of replication was explained by Messelson and Sthal experiment. The cells from 15N medium are transferred to 14N medium the band of intermediate density was observed. The daughter DNA consists of one 15N DNA strand and one 14N DNA strnd. This strand undergo replication in the 14N medium. This time one low density DNA band ( contains 14N - 14N DNA strand) and one intermediate density band ( 14N-15N DNA).

Thus, the correct answer is option (d).

8 0
3 years ago
10. Lichens are among the first organisms to
lara [203]

Answer:

The correct option is H) these acids change the environment.

Explanation:

Soil can be described as the part of the environment where plants grow. In primary succession, life stars arising in an area which has no soil and only rocks, This is possible because lichens are the organisms which can grow on the rocks. Lichens secrete certain acids which break down these rocks and hence soil begins to form when these rocks break. This makes it possible for other plant species to grow on these lands.

8 0
3 years ago
Determine whether each phrase describes ponds or lakes.
VikaD [51]

Answer:

Ponds:

Shallow & warm

A lot of plant and animal life

Many nutrients

Lakes:

Large, deep, cold

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6 0
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________ is the form of vitamin d found in plants.
julia-pushkina [17]
Ergocalciferol is the form of vitamin d found in plants.
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Which of the following cannot be given to children under seven due to damage to their teeth?
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Answer:

The answer is C

Explanation:  s

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