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3 years ago

When electrons flow along the electron transport chains of mitochondria

Biology

1 answer:

IgorC [24]3 years ago

8 0

Answer: a. the ph of the matrix increases

Explanation:

NADH and FADH2 molecules resulting from the Krebs cycle (by reducing respectively NAD + and Electron and proton carriers (e- and H +), are oxidized in the final reactions of cellular respiration, and the electrons and protons are captured by oxygen, the final acceptor. The flow of electrons along the respiratory chain causes the active transport of protons along the chain through the inner membrane of the mitochondria. Protons return to the mitochondrial matrix by diffusion - chemiosmosis - and at the same time, ADP undergoes oxidative phosphorylation forming ATP. Because of this movement of protons inside the matrix, the ph of the matrix increases.

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this element was poisonous to the first forms of life on earth until they evolved to tale advantage of it by using cellular resp

sergey [27]

Answer:

Oxygen

Explanation

Cellular respiration means taking Oxygen and using it to "breathe" and also be used in many other processes.

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2 years ago

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GIVING 50 POINTS AND BRAINLIEST TO CORRECT ANSWER

natka813 [3]

Krebs cycle releases energy in the form of FADH_2 and NaDH

Krebs cycle also known as Citric acid cycle
As it was invented by Sir Hans Krebs So its known as Krebs cycle .

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2 years ago

Why can't both strands of DNA be replicated at the same time?

saw5 [17]

Answer: DNA is a molecule made up of two strands, twisted around each other in a double helix shape. The two strands are complementary which have a 5 prime end and a 3 prime end. To understand this question you must first understand the steps that follow.

DNA Replication:

Step one: 

DNA Helicase (unzips) separates the strands.

Step two:

DNA Primase starts the process and makes a small piece of RNA called a primer. This marks the starting point for the DNA.

Step three:

DNA Polymerase binds to the primer and will make the new strand of DNA. DNA Polymerase can only add DNA bases in one direction, from the 5 prime end to the 3 prime end.

The leading strand is made continuously.
The lagging strand does not run continuously because it runs in the opposite direction. Each fragment is started with an RNA primer. DNA Polymerase then adds a short row of DNA bases from the 5 prime to 3 prime direction. This results in okazaki fragments because it can only replicate in small chunks. The process is repeated.

Step four:

Once the new DNA is complete the enzyme exonuclease removes all the RNA primers from both strands of DNA.

Step five:

Another DNA Polymerase fills in the gaps that are left behind with DNA.

Step six:

DNA Ligase seals up the fragments in DNA, in both strands to make a continuous double strand.

Final answer:

DNA Replication cannot replicate at the same time due to the leading and lagging strand.

Good luck!

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3 years ago

Step 1: drag the lac promoter to the stretch of dna. do not drag the lacz gene to the dna. what happens? why is this?

Marat540 [252]

RNA polymerase binds to the lac promoter and begins transcribing the stretch of DNA to messenger RNA. Therefore, in other words, the stretch of DNA is expressed. The DNA sequence of the lac promoter 'signals' where the RNA polymerase will bind and where transcription will begin. Promoters are found upstream of a gene to be transcribed.

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3 years ago

Provide the composition of Nucleic acids

MaRussiya [10]

Answer: A( adenine) G (Guanine) C (Cytosine) T (Thymine) U (Uracil)

Why? Nucleic acids are polynucleotides—that is, long chainlike molecules composed of a series of nearly identical building blocks called nucleotides. ... Each nucleic acid contains four of five possible nitrogen-containing bases: adenine (A), guanine (G), cytosine (C), thymine (T), and uracil (U).

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2 years ago