Free MCQs & Online Quiz Practice for Exams

Q: Sometimes enzyme and substrate are held together by the kind of bonds called

A) Ionic

B) Hydrogen

C) Hydrophobic

D) Covalent

Q: Which one of the following refers to non-competitive inhibitors?

A) Bind to the active site

B) Similar to the normal substrate with which enzyme interacts

C) Destroy the globular conformation of enzyme

D) Bind to the binding site other than active site

Q: Which one of the following factors does not affect the rate of enzyme action?

A) Enzyme concentration

B) Substrate concentration

C) Water concentration

D) Temperature

Q: The optimum pH value for pepsin to work is

A) 6.8

B) 4.5

C) 5.5

D) 1.5

Q: T-series bacteriophage can be recognized by its

A) Irregular shape

B) Rounded shape

C) Tadpole shape

D) Rhomboidal shape

Q: The infective nature of virus is due to

A) Protein coat

B) Nucleic acid

C) Envelope

D) Tail fibres

Q: Which of the following is not associated with prions?

A) Neurodegenerative disease

B) Leaf curl disease

C) Toxic proteins

D) Alper's syndrome

Q: Which statement is true of viroids?

A) They are single-stranded RNA particles

B) They are single-stranded DNA particles

C) They reproduce only outside of the cell

D) They belong to begomovirus

Q: Which one of the following enzymes is present in the bacteriophage?

A) Succinic dehydrogenase

B) Lysozyme

C) Protease

D) Urease

Q: An infectious RNA particle without protein coat is

A) Viroid

B) Virion

C) Virusoid

D) Prion

Q: Which body system is most directly concerned with vaccination?

A) Digestive

B) Circulatory

C) Respiratory

D) Immune

Q: Tobacco mosaic virus is

A) Spherical shaped

B) Cuboidal

C) Rod shaped

D) Oval shaped

Q: Which one of the following is a disease caused by viroids?

A) Creutzfeldt-Jacob Disease

B) Gerstmann-Straussler-Scheinker

C) Fatal familial Insomnia

D) Cadang-cadang disease

Q: The first forms of life on Earth were thought to be

A) Protista

B) Prokaryotes

C) Insects

D) Large animals such as dinosaurs

Q: Dead Sea are home to which of the following groups of organisms?

A) Halophiles

B) Thermophiles

C) Halophytes

D) Phytoplanktons

Q: Rhizobium belongs to which of the following group of proteobacteria?

A) Alpha-proteobacteria

B) Delta-proteobacteria

C) Gamma-proteobacteria

D) Epsilon-proteobacteria

Q: The first organisms that oxygenated the atmosphere were

A) Cyanobacteria

B) Phototrophic organisms

C) Anaerobic organisms

D) Saprophytes

Q: One feature of prokaryotic genome which makes it different from the eukaryotic genome is

A) It is made up of DNA only

B) It is made up of RNA only

C) It is made up of larger ribosomes

D) It is made up of smaller ribosomes

Q: Organisms most likely to be found in extreme environments are

A) Fungi

B) Algae

C) Viruses

D) Archaea

Q: Peptidoglycan is a characteristic of the walls of

A) Eukaryotic cells

B) Bacterial prokaryotic cells

C) Archaeal prokaryotic cells

D) Bacterial and archaeal prokaryotic cells