Practice Molecular Biology Multiple Choice Questions with Answers Quiz-1

Q.1.

Mode of DNA replication is

Conservative and bidirectional
Semiconservative and unidirectional
Semiconservative and bidirectional
Conservative and unidirectional

Q.2.

What is a prokaryotic organism?

An organism without a nucleus or membrane bound organelles
An organism with a nucleus and membrane bound organelles.
An organism with a nucleus but no membrane bound organelles
An organism with membrane bound organelles but no nucleus

Q.3.

What is a mutation?

change the chromosome structure
Anything in the environment that can cause a mutation
A change in the sequence of bases in DNA or RNA
All of above

Q.4.

What is transcription?

A molecule that contains the genetic code for organisms.
The RNA → Protein part of the central dogma
The DNA → RNA part of the central dogma of molecular biology
The process in which cells make proteins

Q.5.

What is translation?

The RNA → Protein part of the central dogma
The DNA → RNA part of the central dogma of molecular biology
The process in which cells make proteins
A molecule that contains the genetic code of organisms.

Q.6.

What is RNA?

A nucleic acid that processes all steps of protein synthesis in all living cells.
A molecule that contains the genetic code of organisms.
The process in which cells make proteins.
A gene that is damaged or changed in a way to alter the genetic message carried by that gene.

Q.7.

What is a product of photosynthesis?

Glucose
Sun Light
Water
Carbon Dioxide

Q.8.

What is the chemical formula for photosynthesis?

C6H12O6 + 6H2O --> 6CO2 + 6O2 + Sun Light
C6H12O6 + H2O --> CO2 + O2 +ATP
6CO2 + 6O2 + Sun Light --> C6H12O6 + 6H2O
6CO2 + 6H2O + Sun Light --> C6H12O6 + 6O2

Q.9.

What is the energy source for photosynthesis?

Solar Energy
Glucose
ATP
All of above

Q.10.

What is a eukaryotic organism?

An organism without a nucleus or membrane bound organelles
An organism with a nucleus and membrane bound organelles.
An organism with a nucleus but no membrane bound organelles
An organism with membrane bound organelles but no nucleus

Q.11.

Which of the following processes does not occur in prokaryotes?

Transcription
Splicing
Translation
Replication

Q.12.

Which enzyme is used in the unwinding of DNA?

Ligase
Topoisomerase
Helicase
Exonuclease

Q.13.

What are the products of cellular respiration?

oxygen and water
carbon dioxide and water
oxygen and sugar
carbon dioxide and sugar

Q.14.

What is a product of cellular respiration?

Glucose
Oxygen
Sun Light
Carbon Dioxide

Q.15.

MRNA is

used as a template to make protein
part of a ribosme
a small molecule used by the ribosome and is not made into protein
all of the above

Q.16.

What does DNA polymerase do?

connects sugars and phosphates with weak hydrogen bonds
connects sugars and phosphates with strong covalent bonds
connects bases with strong hydrogen bonds
connects bases with strong covalent bonds

Q.17.

How many RNA polymerases are present in a bacterial system?

4
2
1
3

Q.18.

The reactants of photosynthesis are

sugar and water.
sugar and oxygen.
carbon dioxide and water.
carbon dioxide and oxygen.

Q.19.

What type of respiration requires oxygen?

Aerobic
Anaerobic

Q.20.

What is the purpose of cellular respiration?

to break down food
to create energy in the body
to release energy from food
there is none; it's a waste of time

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