Consider statements about genetics: 1. DNA is transcribed into mRNA. 2. mRNA is translated into protein. 3. tRNA carries amino acids to the ribosome. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about genetics: 1. DNA is transcribed into mRNA. 2. mRNA is translated into protein. 3. tRNA carries amino acids to the ribosome. Which are correct?

A. 1 and 3 only

B. 1, 2 and 3

C. 1 and 2 only

D. 2 and 3 only

Answer: Option B

Solution (By JKExamLibrary)

Transcription is the process where the genetic information in a DNA sequence is copied into a complementary messenger RNA (mRNA) molecule by RNA polymerase. Translation is the process where the mRNA sequence is decoded by ribosomes to synthesize a specific polypeptide (protein). Transfer RNA (tRNA) molecules act as adapters, carrying specific amino acids to the ribosome based on the mRNA codon. All statements are correct.

This question belongs to: Science Biology

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1

Share Report

The element that is a component of hemoglobin is:

A. Magnesium

B. Zinc

C. Iron

D. Calcium

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Iron (Fe²⁺) is at the center of the heme group in hemoglobin, enabling reversible oxygen binding. Calcium is in bones, magnesium in chlorophyll, zinc in many enzymes. Iron deficiency leads to anemia.

This question belongs to: Science Biology

Question #2

Share Report

A man with blood group AB marries a woman with blood group O. What are the possible blood groups of their children?

A. A and B only

B. AB and O

C. AB only

D. A, B, AB, and O

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
The man's genotype is Iᴬ Iᴮ (AB) and the woman's genotype is ii (O). Gametes: man produces Iᴬ or Iᴮ, woman produces i only. Offspring: Iᴬ i (blood group A) and Iᴮ i (blood group B). Thus only A and B blood groups are possible. No AB (requires both Iᴬ and Iᴮ) or O (requires ii) children can be produced. This illustrates co-dominance and multiple alleles.

This question belongs to: Science Biology

Question #3

Share Report

Which of the following is a unique feature of plant cells compared to animal cells?

A. Presence of Golgi apparatus

B. Presence of ribosomes

C. Presence of plastids

D. Presence of mitochondria

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Plastids (chloroplasts, chromoplasts, leucoplasts) are unique to plant cells and some protists. They are involved in photosynthesis, storage, and imparting color. Mitochondria, Golgi apparatus, and ribosomes are present in both plant and animal cells. The cell wall and large central vacuole are also distinguishing features of plant cells.

This question belongs to: Science Biology

Explore All Biology MCQs