In genetics, the 'Spliceosome' is a large, complex molecular machine found within the nucleus of eukaryotic cells. Its primary function is to: MCQ with Answer and Explanation

In genetics, the 'Spliceosome' is a large, complex molecular machine found within the nucleus of eukaryotic cells. Its primary function is to:
A. Translate mRNA into protein
B. Remove introns from pre-mRNA and join the exons together to form mature mRNA
C. Synthesize mRNA from a DNA template
D. Add the 5' cap and poly-A tail to mRNA
Answer: Option B
Solution (By JKExamLibrary)
The spliceosome is a large, dynamic complex composed of five small nuclear ribonucleoproteins (snRNPs, pronounced 'snurps') and numerous other protein factors. It assembles on the pre-mRNA transcript in the nucleus. Its primary function is to catalyze the splicing of pre-mRNA: it precisely recognizes the splice sites at the boundaries of introns and exons, removes the non-coding intron sequences, and ligates (joins) the coding exons together to form a continuous, mature mRNA molecule that can be exported to the cytoplasm for translation.

Discuss this Question (0)

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

Practice More Biology Questions

Question #1
The plant cell wall is primarily composed of which of the following?
A. Proteins and Lipids
B. Chitin and Peptidoglycan
C. Silica and Calcium
D. Cellulose, Hemicellulose, and Pectin

Correct Answer: Option D


Explanation:
The plant cell wall is primarily made up of cellulose, hemicellulose, pectins, and proteins. Cellulose provides the main structural framework, while hemicellulose and pectins help in cross-linking and providing flexibility. Chitin is found in fungal cell walls, and peptidoglycan is found in bacterial cell walls.

This question belongs to: Science Biology
Question #2
The condition in which the blood has a lower than normal number of red blood cells or hemoglobin is:
A. Leukemia
B. Anemia
C. Thalassemia
D. Polycythemia

Correct Answer: Option B


Explanation:
Anemia is a deficiency in RBCs or hemoglobin, reducing oxygen-carrying capacity. Causes: iron deficiency, vitamin B₁₂/folate deficiency, blood loss, hemolysis. Polycythemia is excess RBCs, leukemia is cancer of WBCs, thalassemia is a genetic hemoglobin disorder leading to anemia. Anemia causes fatigue and pallor.

This question belongs to: Science Biology
Question #3
The structure that stores sperm and allows maturation is the:
A. Prostate gland
B. Vas deferens
C. Epididymis
D. Seminal vesicle

Correct Answer: Option C


Explanation:
The epididymis is a coiled tube on the testis where sperm mature and are stored. Seminal vesicles and prostate add fluid, vas deferens transports sperm.

This question belongs to: Science Biology