Biology Questions

Q:

Which of the following is present in a prokaryotic cell?

A) Ribosomes B) Chloroplast
C) Mitochondria D) None
 
Answer & Explanation Answer: A) Ribosomes

Explanation:

Ribosomes are present in prokaryotic cells. These are organelles which consist of two subunits. They are present in both Eukaryotic and Prokaryotic cells. They are made up of RNA and proteins and present in the cytoplasm and on the membranes and are involved in protein synthesis.

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Q:

Which of the following defines a genome?

A) Every human cell B) the complete set of an organism's genes and other DNA sequences
C) the complete set of an organism's polypeptides D) a karyotype
 
Answer & Explanation Answer: B) the complete set of an organism's genes and other DNA sequences

Explanation:
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Q:

Hypercalcemia can be caused by

A) malignancy B) hyper-parathyroidism
C) both A & B D) None of the above
 
Answer & Explanation Answer: C) both A & B

Explanation:

Hypercalcemia is a condition in which the calcium level in your blood is above normal. Too much calcium in your blood can weaken your bones, create kidney stones, and interfere with how your heart and brain work.

Hypercalcemia_can_be_caused_by1550553960.png image

Hypercalcemia is usually a result of overactive parathyroid glands.

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Q:

Which best describes the structure of a DNA molecule?

A) A double helix B) A strand of nucleic acids
C) A single strand of amino acids D) A sugar ring
 
Answer & Explanation Answer: A) A double helix

Explanation:

DNA is not a single stranded and does not have amino acids. Hence options, b & C are eiminated. Dna is a double helix structure containing nucleobase—either cytosine (C), guanine (G), adenine (A), or thymine (T)—as well as a monosaccharide sugar called deoxyribose and a phosphate group. 

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Q:

Increasing the Alveolar ventilation rate will

A) Increase the rate of carbon dioxide diffusion from the blood to the alveoli B) Decrease the partial pressure of oxygen in the alveoli
C) Increase the partial pressure of carbon dioxide in the alveoli D) Have no effect on either partial pressure or diffusion rate of gases
 
Answer & Explanation Answer: A) Increase the rate of carbon dioxide diffusion from the blood to the alveoli

Explanation:

Increasing the Alveolar ventilation rate will increase the rate of carbon dioxide diffusion from the blood to the alveoli.

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Q:

Reflex actions are controlled by

A) The Spinal Chord B) The Nerves
C) The cells D) The Brain
 
Answer & Explanation Answer: A) The Spinal Chord

Explanation:

A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain.

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Q:

Which of these best describes genetic drift?

A) Random fluctuations in the gene frequencies within a population Eliminate B) The combining of alleles to create more genetic variations within a population
C) The movement of alleles between population D) A planned method to reduce the number of inferior genes in a population
 
Answer & Explanation Answer: A) Random fluctuations in the gene frequencies within a population Eliminate

Explanation:

Random fluctuations in the gene frequencies within a population Eliminate is the one which best describes genetic drift.

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Q:

Where is the genetic information of the cell stored?

A) DNA B) Cell membrane
C) Nucleus D) None of the above
 
Answer & Explanation Answer: C) Nucleus

Explanation:

The genetic information of the cell is DNA and is stored in the nucleus of the cell.

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