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 Biology Questions

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Q:

Bacteria divide by

A) Binary Fission B) Spirilla
C) RNA D) Fusion
 
Answer & Explanation Answer: A) Binary Fission

Explanation:

Bacteria divided and reproduce by Binary fission. In this process, the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two replicates.

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Q:

The sexual reproductive organs of aspergillus are :

A) Spermatium and Oogonium B) Antheridium and Oogonium
C) Spermatium and Ascogonium D) Antheridium and Ascogonium
 
Answer & Explanation Answer: D) Antheridium and Ascogonium

Explanation:
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Q:

One function of sphincter muscles is to

A) secrete digestive juices into the GI tract B) grind large food particles
C) trigger hormone release D) control the passage of food through the GI tract
 
Answer & Explanation Answer: D) control the passage of food through the GI tract

Explanation:
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Q:

A protein is synthesized in the endoplasmic reticulum bound ribosomes and it targets to the inner thylakoid space of chloroplast. How many double-layered membrane layers it has to pass to reach its destination?

A) 2 B) 3
C) 4 D) 5
 
Answer & Explanation Answer: B) 3

Explanation:

There are 3 double-layered membrane layers, which the protein has to pass to reach its destination.

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Q:

Deficiency of fluoride leads to Which one of the following health problems?

A) Tooth caries B) Mottling of tooth
C) Bending of bones D) Stiffening of joints
 
Answer & Explanation Answer: A) Tooth caries

Explanation:

Fluoride deficiency is a disorder which may cause increased dental caries due to a lack of fluoride in the diet. Dental caries or tooth decay is the breakdown of dental tissues by the acidic products released by the "bacterial fermentation of dietary carbohydrates”

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Q:

Innate immune system defenses include

A) phagocytosis B) B cells
C) plasma cells D) T cells
 
Answer & Explanation Answer: A) phagocytosis

Explanation:
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Q:

What contributes to antigenic shift in influenza viruses?

A) a segmented genome B) different virus subtypes
C) Both A & B D) ease of virus transmission
 
Answer & Explanation Answer: A) a segmented genome

Explanation:
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Q:

Gametes are produced by the process of

A) Mitosis B) Meiosis
C) Both A & B D) None of the above
 
Answer & Explanation Answer: B) Meiosis

Explanation:

A gametes are haploid cells as they have only one set of chromosomes. Meiosis is a process of cellular reproduction in which both male and female gametes are formed. During meiosis, the DNA is only replicated or copied one time.

Gametes_are_produced_by_the_process_of1560944987.png image

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