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3 years ago

When does lactic acid fermentation take place in human cells?

Biology

1 answer:

jekas [21]3 years ago

5 0

Lactic acid fermentation occurs in humans mostly during vigorous activity or exercise.

Fermentation is the process of producing ATP in the absence of oxygen through glycolysis alone. Lactic acid fermentation converts the 3-carbon pyruvate to the 3-carbon lactic acid and regenerates NAD+ in the process, allowing glycolysis to continue to make ATP in low oxygen conditions.

Since there is a limited supply of of NAD+, available in any given cell, this electron acceptor must be regenerated to allow ATP production to continue.

To achieve this, NADH donates its extra electrons to the pyruvate molecules, regenerating NAD+ . When pyruvate accepts these electrons, it is reduced and becomes lactic acid.

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Which of the following organelles found in living cells is not bound by a membrane or membranes?

algol13

Answer:

Prokaryotic cells lack a nucleus and membranous organelles.

Explanation:

Prokaryotic cells have the following features: 1. The genetic material (DNA) is localized to a region called the nucleoid which has no surrounding membrane.

7 0

3 years ago

Read 2 more answers

A population is in Hardy-Weinberg Equilibrium with respect to a gene, "yellow," which has 2 alleles, y and Y. Y, the wild type a

Anton [14]

Answer:

The frequency of the Y allele is 0.7

The frequency of the y allele is 0.3

The frequency of the YY homozygote is 0.49

The frequency of the Yy heterozygote is 0.42

Explanation:

According to Hardy-Weinberg Equilibrium,

p + q = 1

p² + 2pq + q² = 1

where,

p = frequency of dominant allele

q = frequency of recessive allele

p² = frequency of dominant homozygous genotype

2pq = frequency of heterozygous genotype

q² = frequency of recessive homozygous genotype

Here,

yy = q² = 0.09

frequency of y allele = q = √0.09 = 0.3

frequency of Y allele = p = 1-q = 1-0.3 = 0.7

p² = YY = (0.7)² = 0.49

2pq = Yy = 2 * 0.7 * 0.3 = 0.42

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4 years ago

Several months ago, Ambreena suffered moderate brain damage following the surgical removal of a brain tumor. Her husband is perp

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Answer:vvb

Explanation:

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3 years ago

Help me please!!!... and thank you!!

xz_007 [3.2K]

Answer:

Karyotype- Abnormal

it's a Trisomy of the X chromosome: it's a form of aneuploidy

The disorder is called Triple X syndrome. It's characterized by tall stature, vertical skin folds, poor muscle tone, and a curve in the 5th finger towards the 4th and small head (microcephaly),

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3 years ago

Select the phrases that accurately describe properties of the most common form of the DNA double helix. There is more than one c

zhuklara [117]

Answer:

A strand of DNA comprises pyrimidines, that is, cytosine and thymine and purines, that is, adenine and guanine. Of these pairing takes place between thymine and adenine and guanine and cytosine. Thus, it can be said that in DNA, the amount of adenine is corresponding to thymine, and the concentration of guanine is corresponding to cytosine. Hence, the given first statement is correct.

DNA gives an appearance of a helical structure, in which each of the helices comprises approximately 10 nucleotides within them. Hence, the given second statement is also correct.

The strands of DNA found in a helical structure are complementary to each other, or it can also be stated that the nucleotides present in one strand of the DNA are found in opposite direction and orientation with respect to the second strand of the DNA. The phosphodiester bonds play an essential function in combining a molecule of sugar of one nucleotide with the molecule of phosphate of the adjacent nucleotide. Hence, the given fourth statement is also correct.

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3 years ago