Biology Questions

Q:

Genes are made of 

A) Carbohydrates B) Proteins
C) Fats D) Nucleotides
 
Answer & Explanation Answer: D) Nucleotides

Explanation:

Genes : The DNA is the genetic material. The DNA is made of several nucleotides. A nucleotide means, one nitrogenous base one sugar molecule and a phosphate molecule. These nucleotides occur in sequences and several nucleotides form one Gene ( a functional mgene is called a cistron)

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Q:

Which of the following is a feature of leptin?

A) It acts primarily on the brain B) It is secreted by the brain and acts on fat cells
C) It is an enzyme D) It is usually deficient in thin people
 
Answer & Explanation Answer: B) It is secreted by the brain and acts on fat cells

Explanation:
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Q:

What process accounts for species diversity?

A) Predation B) Mitosis
C) Symbiosis D) Meiosis
 
Answer & Explanation Answer: D) Meiosis

Explanation:

The process accounts for species diversity is Meiosis. Meiosis is termed as a specialized cell division which reduces chromosomes number by half and then creates for haploid cells.

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Q:

Which can disrupt the cell cycle?

A) Mutation B) Replication
C) Both A & B D) None of the above
 
Answer & Explanation Answer: D) None of the above

Explanation:

Mutations can disrupt the cell cycle, and can cause certain diseases and conditions.

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Q:

Which process occurs inside the chloroplasts?

A) Photosynthesis B) Glycolysis
C) Oxidation D) None of the above
 
Answer & Explanation Answer: A) Photosynthesis

Explanation:

The process that occurs inside the chloroplasts is photosynthesis. The light from the sun is obserbed and combining with water and CO2, plants prepare food for the plants.

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Q:

Phosphorescence is a phenomenon associated with which algal division?

A) Dinoflagellates B) Brown algae
C) Red algae D) Euglenophytes
 
Answer & Explanation Answer: D) Euglenophytes

Explanation:

Phosphorescence is a phenomenon associated with an algal division called euglenophytes. 

 

Phosphorescence is a phenomenon when an object is capable of releasing photons of light at a longer wavelength in response to absorbing light of a shorter wavelength. The object releasing the light only releases the light after some time has passed since it absorbed the light of a short wavelength.

 

Euglenophytes are single-celled plant-like protists that have no cell wall.

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Q:

Which of the following statements is not true about metabolism?

A) Younger people generally have a slower metabolism than adults. B) Basal metabolism is the amount of energy needed for sustaining life.
C) Basal metabolism is measured by the amount of calories burned when your body is inactive. D) Metabolism is influenced by numerous factors, such as heredity and age.
 
Answer & Explanation Answer: A) Younger people generally have a slower metabolism than adults.

Explanation:

Metabolism is the set of life-sustaining chemical transformations within the cells of organisms. The three main purposes of metabolism are the conversion of food/fuel to energy to run cellular processes, the conversion of food/fuel to building blocks for proteins, lipids, nucleic acids, and some carbohydrates, and the elimination of nitrogenous wastes.

 

Younger people have faster metabolism than adults. Hence, the given statement 'Younger people generally have a slower metabolism than adults' is FALSE.

 

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Q:

Spongy, porous bone tissue is also called

A) Compact bone B) Bone fissure
C) Yellow bone marrow D) Cancellous bone
 
Answer & Explanation Answer: D) Cancellous bone

Explanation:

Spongy, porous bone tissue is also called cancellous bone.

 

Cancellous bone is found in bones that aren't generally under significant stress like in the shoulder blades, ribs, parts of the skull, and at the ends of long bones.

 

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