Consider statements about genetics: 1. DNA contains the sugar deoxyribose. 2. RNA contains the sugar ribose. 3. DNA is single-stranded. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about genetics: 1. DNA contains the sugar deoxyribose. 2. RNA contains the sugar ribose. 3. DNA is single-stranded. Which are correct?

A. 1 and 3 only

B. 2 and 3 only

C. 1 and 2 only

D. 1, 2 and 3

Answer: Option C

Solution (By JKExamLibrary)

DNA (deoxyribonucleic acid) is characterized by the presence of the pentose sugar deoxyribose in its nucleotide backbone. RNA (ribonucleic acid) contains the pentose sugar ribose. DNA is typically a double-stranded helical molecule, providing stability for long-term genetic storage. RNA is generally single-stranded, allowing it to fold into complex shapes and perform various functional roles like mRNA, tRNA, and rRNA. Thus, statements 1 and 2 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 fluid that circulates in the lymphatic system is called:

A. Tissue fluid

B. Plasma

C. Serum

D. Lymph

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Lymph is the fluid within lymphatic vessels, derived from interstitial fluid that has entered lymph capillaries. It contains white blood cells, especially lymphocytes, and transports fats (as chyle) from the intestine. Plasma is blood fluid, serum is plasma without clotting factors, tissue fluid is interstitial.

This question belongs to: Science Biology

Question #2

Share Report

The process of movement of water from a hypotonic solution to a hypertonic solution across a semipermeable membrane is:

A. Active transport

B. Facilitated diffusion

C. Osmosis

D. Diffusion

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Osmosis is the net diffusion of water through a selectively permeable membrane from a region of low solute (high water potential) to high solute (low water potential).

This question belongs to: Science Biology

Question #3

Share Report

Who was the first scientist to view live sperm cells and bacteria under a microscope?

A. Robert Hooke

B. Robert Koch

C. Louis Pasteur

D. Antonie van Leeuwenhoek

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Antonie van Leeuwenhoek, using his hand-crafted single-lens microscopes, was the first to observe and describe living sperm cells, bacteria, protozoa, and red blood cells in the 1670s. Hooke saw dead cork cells, Pasteur and Koch later advanced microbiology with germ theory and pure culture techniques.

This question belongs to: Science Biology

Explore All Biology MCQs