Biology 9th Chap 2 : Topic 11 - Maryam Publications

Biology Chapter 2 : Topic 11

DNA, RNA and Protein Synthesis

1 / 15

The flow of genetic information in a cell is correctly represented by:

A) Protein → RNA → DNA

B) Protein → DNA → RNA

C) RNA → DNA → Protein

D) DNA → RNA → Protein

2 / 15

The process by which information from DNA is copied into RNA is called:

A) Transcription

B) Digestion

C) Respiration

D) Translation

3 / 15

The process in which RNA directs the synthesis of proteins is called:

A) Transcription

B) Replication

C) Translation

D) Diffusion

4 / 15

During transcription, genetic information is transferred from:

A) Protein to DNA

B) DNA to RNA

C) Protein to RNA

D) RNA to DNA

5 / 15

Which molecule carries genetic instructions from DNA to ribosomes?

A) Lipid

B) Protein

C) DNA

D) mRNA

6 / 15

Ribosomes are the sites where:

A) Lipids are stored

B) Proteins are synthesized

C) DNA replication occurs

D) Chromosomes are formed

7 / 15

If transcription is blocked in a cell, which molecule will not be produced from DNA?

A) RNA

B) Protein

C) Lipid

D) Carbohydrate

8 / 15

Which sequence correctly describes protein production?

A) DNA → RNA → Protein

B) RNA → DNA → Protein

C) DNA → Protein → RNA

D) Protein → RNA → DNA

9 / 15

A mutation occurs in DNA. Which molecule will most directly receive the altered information first?

A) RNA

B) Carbohydrate

C) Protein

D) Lipid

10 / 15

The main role of mRNA in protein synthesis is to:

A) Form cell membranes

B) Carry instructions from DNA to ribosomes

C) Store fats

D) Replicate DNA

11 / 15

Which statement best explains the relationship between DNA and proteins?

A) Proteins produce DNA.

B) DNA is made of proteins.

C) DNA contains instructions for making proteins.

D) Proteins store hereditary information.

12 / 15

If a cell cannot produce mRNA, the immediate effect will be:

A) Increased carbohydrate storage

B) Increased lipid formation

C) More DNA production

D) Failure of protein synthesis

13 / 15

During translation, ribosomes use information present in:

A) mRNA

B) DNA

C) Lipids

D) Cell membrane

14 / 15

Why can a change in DNA affect the structure of a protein?

A) DNA directly becomes protein.

B) DNA determines the information carried by RNA.

C) RNA stores fats.

D) Proteins copy DNA.

15 / 15

Which statement summarizes the role of DNA, RNA, and proteins?

A) Proteins store information, DNA transports information, and RNA forms fats.

B) RNA stores information, DNA carries information, and proteins form genes.

C) DNA stores information, RNA carries information, and proteins perform cellular functions.

D) DNA, RNA, and proteins all perform the same role.

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