What does potassium (K+) deficiency cause in plants?
Correct answer A. Premature death of leaves
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Biology MCQs
Page 47 of Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 47 of 75
Which structures carry out mastication?
Correct answer C. Teeth
A deficiency of which nutrient causes chlorosis?
Correct answer D. Both A and B
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In which of the following is magnesium present?
Correct answer C. Chlorophyll
Which enzyme converts dipeptides into amino acids?
Correct answer A. Erepsin
For what are carbohydrates, fats and proteins essential?
Correct answer D. All of these
Which cells produce pepsinogen?
Correct answer A. Zymogen cells
What happens to the host DNA during the lytic cycle of a bacteriophage?
Correct answer B. Digested into its nucleotides
In what form can a temperate phage exist?
Correct answer B. Prophage
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Which of the following is an RNA virus?
Correct answer B. Influenza virus
What happens to the bacteriophage DNA during the lysogenic cycle?
Correct answer C. It joins the bacterial chromosome
What is the shape of the tobacco mosaic virus?
Correct answer A. Rod Shaped
In the bacteriophage life cycle, which step follows attachment of the phage to the receptor site on the bacterial cell wall?
Correct answer D. Penetration
Which disease causes paralysis because the virus attacks the central nervous system?
Correct answer D. Polio
In the lysogenic cycle, what is the separation of phage DNA from the host chromosome and the start of the lytic cycle called?
Correct answer C. Induction
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Which enzyme converts single-stranded viral RNA into double-stranded DNA?
Correct answer A. Reverse Transcriptase
Which statement about the lysogenic cycle of a bacteriophage is incorrect?
Correct answer C. Lysogenic bacteria may get infected by the related phage
Which virus is especially associated with tumour formation?
Correct answer C. Retrovirus
What controversial agent causes mad cow disease?
Correct answer C. Prion
Which of these is the smallest known virus?
Correct answer C. Polio virus