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3 years ago

Which of the following statements about gluconeogenesis in animal cells is true?

Biology

1 answer:

MakcuM [25]3 years ago

7 0

Answer:

C. THE CONVERSION OF FRUCTOSE 1,6-BISPHOSPHATE to fructose- 6- phosphate is not catalyzed by phosphofructokinase -1, the enzyme involved in glycolysis.

Explanation:

This statement is true as the enzyme involved in this step is FRUCTOSE-1,6-BISPHOSPHATASE.

Gluconeogenesis is the coversion of non-carbohydrate molecules (lactic acid, amino acids, glycerol) through the pyruvic acid into glucose in the cells.

This process takes place mainly in the liver and occurs during periods of fasting, starvation, low carbohydrate diets.

The pathway of gluconeogenesis involves eleven steps of enzymatic catalyzed reactions.

In the conversion of fructose 1,6- bisphosphate to fructose-6-phosphate is catalyzed by fructose 1,6-bisphosphatase and not by phosphofructokinase -1 which is involved in glycolysis. This step is a rate-limiting step of the pathway.

The conversion of glucose-6-phospahte to glucose is not catalyzes by hexokinase but glucose -6- phosphatase.

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In guinea pigs coat color is determined by a single gene with two alleles. A guinea pig from a true-breeding black strain is mat

OLga [1]

Answer:

1/3 of black F2 progeny will be homozygous.

Explanation:

Here, BB = black coat color = true breeding dominant black strain

bb = white coat color = true breeding recessive white strain

When true breeding black and white guinea pigs are mated to give F1 progeny:

BB X bb = Bb ( all black guinea pigs )

When two of the F1 guinea pigs are mated to give F2 progeny:

Bb X Bb = BB, Bb, Bb, bb

F2 progeny has 3/4 progeny as black (BB and Bb) . Out of them 1/3 are homozygous and 2/3 are heterozygous.

Hence, 1/3 of black F2 progeny will be homozygous.

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3 years ago

Six examples of vectors

schepotkina [342]

Answer:

Mosquitoes West Nile Virus St. Louis Encephalitis Western

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2 years ago

Read 2 more answers

Which of the following best describes the cell cycle?

zhenek [66]

Correct answer: B). Cells spend the most time in interphase, where they grow and their DNA replicates.

The cell spends its most of the time in the interphase, during this phase of growth, cell continues to grow and carry out its metabolic activities which are necessary for regular growth and maintenance.

During this phase of the cell cycle, a lot of protein is synthesized in order to double its size. The important changes that occur in this phase include DNA duplication and division of chloroplast and mitochondria.

Hence, the correct answer would be option B.

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3 years ago

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A person cannot see a single cotton thread 100 feet away, but if you wound thousands of threads together into a rope, it would b

Elena-2011 [213]

Answer:

Yes, it is

Explanation:

It is very much analogous. Just as in the analogy explained, DNA isn't visible to the naked eye when it is alone or single, or just one. On the other hand, it is very much easier to see when the DNA are in a cluster, just like in the cotton example.

Succinctly put, the example is analogous to DNA extraction

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2 years ago

Some people use the terms "cell cycle" and "mitosis" as if they were the same thing. Which of these best describes why they are

Komok [63]

Answer: C. Cells in meiosis have unique genetic information

Explanation: Meiosis is the cell division that forms four daughter cells from one parent cell. It includes two successive divisions called as meiosis I and meiosis II. Crossing over during prophase I of meiosis I imparts new gene combinations to the daughter cells of meiosis. Hence, daughter cells formed by the end of meiosis have some new gene combinations, that is, unique genetic information.

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3 years ago