Biomolecules : Introduction and their roles in environment

This MCQs is about biomolecules which play indispensable roles in all life processes, including disease development, so the accurate detection of biomolecules is critical to disease diagnosis and therapy.

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Which of these is an amino acid with pH less than 7?

Valine Lysine Glutamic acid Histidine

Which amino acid has a hydroxy methyl group as R?

Tryptophan Lysine Serine Leucine

Which of these amino acids is not aromatic?

Tyrosine Methionine Tryptophan Phenylalanine

Which of these is a neutral amino acid?

Valine Histidine Lysine Aspartic acid

Which of the following statements regarding enzyme inhibition is correct?

Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein Non-competitive inhibitors often bind to the enzyme irreversibly Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate

Which of the following is not a pyrimidine?

Uracil Cytosine Guanine Thymine

Hydrolysis of starch occurs with the help of

Peptidase Amylase Sucrose Lipase

Which group contains all polysaccharides?

Glycogen, sucrose and maltose Maltose, lactose and sucrose Glycogen, glucose and sucrose Glycogen, cellulose and starch.

Amino acids are formed from

Proteins Fatty acids Volatile acid α < -keto acids.

A nucleoside is formed of

Phosphate and nitrogen base Pentose sugar and phosphate Pentose sugar, phosphate and nitrogen base Pentose sugar and nitrogen base.

The most abundant component of a cell is

Lipid Protein Water Cellulose

Glucose is a

Ketose hexose sugar Pyronose pentose sugar Aldose hexose sugar Furanose pentose sugar.

Enzymes increase the rate of reaction by

Lowering activation energy

Increasing activation energy

Increasing temperature and pH

Decreasing temperature and pH

An example of competitive inhibition of an enzyme is the inhibition of

Succinic dehydrogenase by malonic acid

Cytochrome oxidase by cyanide

Hexokinase by glucose-6-phosphate

Carbonic anhydrase by carbon dioxide

: Glycogen is a polymer of

Glucose

Sucrose

Galactose

Fructose

: Most abundant organic compound on earth is

Cellulose

Steroids

Protein

Lipids

: Protein synthesis in a cell takes place

In cytoplasm as well as in mitochondria

In the nucleolus as well as in cytoplasm

Only on ribosomes attached to the nuclear envelope

Only in the cytoplasm

: Carrier ions like Na+ facilitate the absorption of substances like:

Amino acids and glucose

Glucose and fatty acids

Fatty acids and glycerol

Fructose and some amino acids

In RNA, thymine is replaced by -

Uracil

Guanine

Both

None of these

Which amino acid has a methyl group as R?

Serine

Glycine

Valine

Alanine

Quiz/Test Summary

Title: Biomolecules : Introduction and their roles in environment

Questions: 20

Contributed by:

Steve Mon, Mar 28, 2022 07:14 AM UTC

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