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GalinKa [24]
3 years ago
14

A zebra cell is just about to replicate its DNA. What happens first?

Biology
1 answer:
vlada-n [284]3 years ago
5 0

Answer:

Enzymes unwind the DNA molecule into two strands.

Explanation:

I just took the quiz and it was correct

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Of the following lists of electron transport compounds, which one lists them in order from the one containing electrons with the
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Answer:

B) FADH2 -- FMN of Complex I -- Fe-S of Complex II -- Q -- Fe-S of Complex III -- Cyt c -- Cyt a of Complex IV -- O2

Explanation:

FADH2 and NADH give their high energy electrons to the terminal electron acceptor molecular oxygen via an electron transport chain. As the electrons move through electron carriers of the electron transport chain, they lose their free energy. Part of the free energy of the electrons is used to pump the protons from the matrix into the intermembrane space. Therefore, part of the energy of electrons is temporarily stored in the form of a proton concentration gradient.

NADH gives its electrons to FMN of complex I while FADH2 gives its electrons to the Fe-S center of complex II. Both the complexes are oxidized by coenzyme (Q) which in turn reduces Fe-S centers of complex III. Cyt c of complex IV obtains electrons from complex III and passes them to CuA center, to heme "a" to heme "a3-CuB center" and finally to the molecular oxygen.

So, the compounds arranged with respect to the energy content of electrons in descending order are as follows: FADH2 -- FMN of Complex I -- Fe-S of Complex II -- Q -- Fe-S of Complex III -- Cyt c -- Cyt a of Complex IV -- O2.

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4 years ago
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Fermentation is a process that mainly converts the carbohydrates to energy and also converts sugar to acids, alcohol or gases. Fermentation is a process that allows any organism to survive without oxygen and fermentation is the cells main ATP producing stimulant. The study and science of formation is known as Zymology. Fermentation is a process that is most common in certain organisms like yeast, bacteria etc. Fermentation comes to human use as well for making alcohols and different types of breads.  <span> </span>
5 0
4 years ago
Biodiversity is the number of species...
Oksana_A [137]
Biodiversity refers to a varitety if life in the world, or habitate, ecosystem. 
So the answer that is best to choose would be: D Living with in an eco system.
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eduard
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