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miv72 [106K]
3 years ago
13

(I will give brainlyist)

Biology
1 answer:
love history [14]3 years ago
5 0

Answer:

Ss for the top and TT and Tt

Explanation:

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Why are nitrogen-fixing bacteria important?
boyakko [2]

Answer:

Most organisms cannot obtain nitrogen from the atmosphere. Nitrogen fixing bacteria take Nitrogen out of the atmosphere and make it available for consumption by the other organisms, This is important because Nitrogen is an essential building block of life.

4 0
3 years ago
3. What are some scientific explanations for the history of life on Earth?
KATRIN_1 [288]

Answer:

Many scientists favor the RNA world hypothesis, in which RNA, not DNA, was the first genetic molecule of life on Earth. Other ideas include the pre-RNA world hypothesis and the metabolism-first hypothesis. Organic compounds could have been delivered to early Earth by meteorites and other celestial objects

7 0
3 years ago
Derived from a 6 membered ring. Contains Cytosine, Thymine, and Uracil.
dybincka [34]

Answer:

b. Nucleotides  

Explanation:

Nucleic acids are examples of structures formed from nucleotides. And in relation to the composition of DNA, we have the formation of the largest cellular macromolecule, all formed by nucleotides.

The nucleotide is a group formed by the association of 3 molecules - a nitrogen base, a phosphate group and a pentose glycide. Thus, we may have variations within these ligands, such as: in DNA we have the presence of pentose deoxyribose, while in RNA we have the presence of pentose ribose.

The nucleotides have differences in relation to its nitrogen base, which can be purine or pyrimidine. Purine bases vary in Adenine and Guanine, while pyrimidine bases are classified in Thymine, Uracil and Cytosine. Purine and pyrimidine bases are complementary and each have specific binders. Thus, we have that the purine base Adenina, binds with the pyrimidine bases Timina and Uracila, while the base Guanina binds exclusively to Cytosine and vice versa.

5 0
3 years ago
This responds to messages from the communication system and changes its level
alina1380 [7]

Answer:

sensors, control center, communication system, target

Explanation:

4 0
3 years ago
What are the end products of lactic acid fermentation and alcoholic fermentation?
3241004551 [841]
Lactic acid fermentation produces lactic acid, while alcoholic fermentation produces ethanol. Both fermentation pathways also oxidize NADH to NAD+ during the process.
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3 years ago
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