The hormone that promotes the breakdown of glycogen to glucose in the liver is: MCQ with Answer and Explanation

The hormone that promotes the breakdown of glycogen to glucose in the liver is:
A. Thyroxine
B. Cortisol
C. Glucagon
D. Insulin
Answer: Option C
Solution (By JKSSB Mock Tests)
Glucagon, released by pancreatic alpha cells when blood glucose is low, activates glycogen phosphorylase, leading to glycogenolysis and release of glucose from the liver. Insulin promotes glycogenesis. Cortisol and thyroxine have permissive effects.

Discuss this Question (0)

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

Practice More Biology Questions

Question #1
The scientist who first observed and described living microorganisms (animalcules) using a single-lens microscope was:
A. Robert Hooke
B. Antonie van Leeuwenhoek
C. Rudolf Virchow
D. Matthias Schleiden

Correct Answer: Option B


Explanation:
Antonie van Leeuwenhoek, a Dutch tradesman, is credited as the 'father of microbiology'. In the 1670s, using his own handcrafted, high-quality single-lens microscopes (which could magnify up to 270x), he was the first person to observe and describe living, single-celled organisms, which he called 'animalcules'. These included bacteria, protozoa, and spermatozoa. Robert Hooke observed dead cells (cork) and coined the term 'cell'.

This question belongs to: Science Biology
Question #2
Identify the correct statement about photosynthesis:
A. Rubisco is the enzyme that fixes CO₂ in the Calvin cycle.
B. The light reactions occur in the stroma.
C. ATP and NADPH are produced during the Calvin cycle.
D. Photorespiration increases the efficiency of photosynthesis.

Correct Answer: Option A


Explanation:
Rubisco catalyzes CO₂ fixation. Light reactions occur in thylakoids, ATP/NADPH are produced there, Calvin cycle uses them. Photorespiration reduces efficiency.

This question belongs to: Science Biology
Question #3
The enzyme that catalyzes the synthesis of RNA from a DNA template is:
A. DNA polymerase
B. Ligase
C. RNA polymerase
D. Helicase

Correct Answer: Option C


Explanation:
RNA polymerase binds to the promoter region of DNA and synthesizes a complementary RNA strand during transcription. DNA polymerase synthesizes DNA, ligase joins DNA fragments, helicase unwinds DNA.

This question belongs to: Science Biology