General Science and Nature

A

Adenine

B

Uracil

C

Thymine

D

Cytosine

Explanation Comments

A

Carrying amino acids to the ribosome

B

Forming the structure of ribosomes

C

Synthesizing mRNA from DNA

D

Breaking down proteins into amino acids

Explanation Comments

A

The repressor is inactivated

B

RNA polymerase is inhibited

C

The repressor binds to the operator

D

The genes for lactose metabolism are turned off

Explanation Comments

A

DNA ligase

B

Topoisomerase

C

DNA polymerase

D

Helicase

Explanation Comments

A

Nondisjunction

B

Independent assortment

C

Unequal crossing over during meiosis

D

Point mutation

Explanation Comments

A

G2 phase

B

S phase

C

M phase

D

G1 phase

Explanation Comments

A

It repairs mismatched bases during DNA replication

B

It adds repetitive sequences to the ends of chromosomes

C

It shortens telomeres during cell division

D

It is active in most somatic cells

Explanation Comments

A

Transcription

B

Translation

C

Transformation

D

Replication

Explanation Comments

A

siRNA

B

tRNA

C

mRNA

D

rRNA

Explanation Comments

A

DNA is translated directly into protein

B

RNA is transcribed into DNA, which is translated into protein

C

DNA is transcribed into RNA, which is translated into protein

D

Protein is transcribed into RNA, which is translated into DNA

Explanation Comments

All MCQs

Which nitrogenous base is not found in RNA?

Explanation:

What is the role of tRNA in protein synthesis?

Explanation:

In the lac operon model, what happens when lactose is present?

Explanation:

What enzyme is responsible for unwinding the DNA double helix during replication?

Explanation:

Which of the following mechanisms can lead to gene duplication?

Explanation:

During which phase of the cell cycle does homologous recombination primarily occur?

Explanation:

Which of the following statements is true about telomerase?

Explanation:

What is the term for the process by which mRNA is synthesized from a DNA template?

Explanation:

Which of the following is not a type of RNA involved in protein synthesis?

Explanation:

What is the central dogma of molecular biology?

Explanation:

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