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 Biology Questions

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Q:

Which of the following bacterium causes crown gall disease in plants?

A) Bacillus thurigiensis B) Agrobacterium tumefaciens
C) Pseudomonas fluorescens D) None of these
 
Answer & Explanation Answer: B) Agrobacterium tumefaciens

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Q:

The process of copying genetic information from one strand of DNA into RNA is termed as

A) translation B) transcription
C) replication D) mutation
 
Answer & Explanation Answer: B) transcription

Explanation:

The process of copying genetic information from one strand of the DNA into RNA is termed as transcription. In transcription, only a segment of DNA and only one of the strands is copied into RNA. This necessitates defining the boundaries that would demarcate the region and the strand of DNA that would be transcribed.

 

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Q:

Asexual reproduction differs from sexual reproduction in that in asexual reproduction, ______

A) the new organisms are genetically identical to the parent B) the gametes are produced in reproduction
C) the nuclei of gametes fuse D) the offspring shows variations
 
Answer & Explanation Answer: A) the new organisms are genetically identical to the parent

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Q:

Clove is obtained from

A) Root B) Stem
C) Leaves D) Flower buds
 
Answer & Explanation Answer: D) Flower buds

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Q:

Control processes depend on which part of the brain

A) hypothalamus B) amygdala
C) cerebellum D) prefrontal cortex
 
Answer & Explanation Answer: D) prefrontal cortex

Explanation:

Control processes depend on the prefrontal cortex which shrinks with age. Inadequate control processes may explain why many older adults have extensive vocabs (measured by written tests) but limited fluency (when they write or talk).

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Q:

Which among the following have a perfect pair of sex chromosomes?

A) Only men B) Only women
C) Both men and women D) Neither men nor women
 
Answer & Explanation Answer: B) Only women

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Q:

Breaking down of fats from large globules to smaller globules by Bile juice is similar to which of the following?

A) Emulsification of soaps B) Esterification of alcohol
C) Fermentation of glucose D) Eutrophication of water
 
Answer & Explanation Answer: A) Emulsification of soaps

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Q:

What is the function of guard cells of stomata?

A) Opening of stomata only B) Closing of stomata only
C) Both opening and closing of stomata D) Neither opening nor closing of stomata
 
Answer & Explanation Answer: C) Both opening and closing of stomata

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