Biology - Mock Test 123

Question 1221

The coenzyme is ?

A) often a metal B) always a protein C) often a vitamin D) always an inorganic compound

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Question 1222

The general mechanism is that an enzyme acts by ?

A) reducing the energy of activation B) increasing the energy of activation C) decreasing the pH D) increasing the pH

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Question 1223

The rough endoplasmic reticulum (RER) in the cells are because of the presence of ?

A) Mitochondria associated with ER B) Ribosomes on the surface of ER C) Volutin granules on the surface of ER D) Sulphur granules on the surface of ER

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Question 1224

Polysome is formed by ?

A) Ribosomes attached to each other in a linear arrangement B) Several ribosomes attached to a single mRNA C) Many ribosomes attached to a strand of endoplasmic reticulum D) A ribosome with several subunits

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Question 1225

Vacuole in a plant cell?

A) Lacks membrane and contains water and excretory substances B) Is membrane-bound and contains storage proteins and lipids C) Is membrane-bound and contains water and excretory substances D) Lacks membrane and contains air

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Question 1226

Cytoskeleton is made up of ?

A) Proteinaceous filaments B) Calcium carbonate granules C) Callose deposits D) Cellulosic microfibrils

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Question 1227

Cell wall consists of?

A) Lignin, hemi cellulose, pectin and lipid B) Lignin, hemi cellulose, pectin and cellulose C) Lignin hemi cellulose, protein and lipid D) Hemi cellulose, cellulose, tubulin and lignin

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Question 1228

What is the common point of similarity between DNA and RNA?

A) Both are double stranded B) Both have identical sugar molecules C) Both have identical pyrimidine bases D) Both are polymers of nucleotides

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Question 1229

If a cell has twice as much DNA as in a normal functional cell, it means that the cell ______ ?

A) has completed division B) is preparing to divide C) has ceased to function D) has reached the end of its lifespan

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Question 1230

A nucleosome is a portion of the chromonema containing ______ ?

A) both DNA and histones B) only histones C) both DNA and RNA D) only DNA

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