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arlik [135]
3 years ago
15

Darwin focused on studying specific species on the Galapagos Islands and other places and observed

Biology
1 answer:
ANEK [815]3 years ago
5 0
The answer is the 1st statement.
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Maksim231197 [3]

Answer:

that one is hard because we did not see the vidoe

Explanation:

8 0
2 years ago
There are 64 codons and 20 amino acids. which of the following is true.
arsen [322]
A: several different codons can specify the same amino acid.
7 0
3 years ago
Why do organisms without oxygen need to convert pyruvate to lactate?
IrinaK [193]

The question is incomplete. The complete question is:

Question: Why do organisms without oxygen need to convert pyruvate to lactate?

A) because pyruvate is toxic to the cells

B) in order to regenerate NAD+

C) in order to use lactate in the citric acid cycle

D) because lactate is needed to produce ATP

Answer:

B) in order to regenerate NAD+

Explanation:

Kreb's cycle and electron transport chain (ETC) are the aerobic stages of cellular respiration. ETC regenerates NAD+ and FAD+ by oxidation of NADH and FADH2 produced during glycolysis and Kreb's cycle. Here, oxygen serves as the terminal electron acceptor.

Glycolytic reactions use NAD+ as an electron acceptor and produce NADH. Therefore, a constant supply of NAD+ is required to sustain glycolysis. In absence of oxygen, ETC cannot occur and organisms convert pyruvate into lactate. Pyruvate is reduced in lactate and NADH serves as the electron donor. Thereby, lactate fermentation regenerates NAD+ to continue the process of glycolysis.

3 0
3 years ago
Which statement accurately describes the atoms of a specific element.
Sveta_85 [38]
A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus. hope this helped :)
4 0
3 years ago
The mass of some corn plants at the end of their growth period was 6 tons per acre. Most of this mass was produced from?
Aleksandr [31]
<span>The majority of mass of any plant is produced from water from the soil and carbon dioxide with sunlight from the air. 6 CO2 + 6 H2O + sunlight ---> C6H12O6 + 6 O2 ... The gluclose (C6H12O6) is a simple sugar that becomes the biomass of the plant. Other minor contributors to the mass are from fertilizers (mostly N, P, and K) and minerals.</span>
8 0
3 years ago
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