The gland that is both exocrine and endocrine in function is the: MCQ with Answer and Explanation

The gland that is both exocrine and endocrine in function is the:
A. Pancreas
B. Adrenal
C. Pituitary
D. Thyroid
Answer: Option A
Solution (By JKExamLibrary)
The pancreas functions as an exocrine gland (secreting digestive enzymes into the duodenum via the pancreatic duct) and an endocrine gland (secreting insulin, glucagon, somatostatin from the islets of Langerhans into the blood). Thyroid, pituitary, and adrenals are purely endocrine.

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Question #1
The type of asexual reproduction in yeast where a small outgrowth develops into a new individual is:
A. Budding
B. Fragmentation
C. Spore formation
D. Binary fission

Correct Answer: Option A


Explanation:
Budding is an asymmetric division where a new yeast cell forms as a small bud on the parent, eventually pinching off. Binary fission is symmetric splitting (bacteria), fragmentation is breaking into pieces, spore formation involves spores. Budding can occur in some hydra as well.

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Question #2
Which enzyme is responsible for unwinding the DNA double helix during replication?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase

Correct Answer: Option B


Explanation:
Helicase unwinds the DNA helix at the replication fork by breaking hydrogen bonds between base pairs. DNA polymerase adds nucleotides, ligase seals Okazaki fragments, primase synthesizes RNA primer. This coordinated action ensures accurate semi-conservative replication. Without helicase, the strands would not separate. Energy for unwinding comes from ATP hydrolysis.

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Question #3
Consider statements about environment: 1. Deforestation leads to soil erosion. 2. Afforestation helps in carbon sequestration. 3. Plastic is biodegradable. Which are correct?
A. 1, 2 and 3
B. 1 and 2 only
C. 2 and 3 only
D. 1 and 3 only

Correct Answer: Option B


Explanation:
Deforestation, the removal of trees and vegetation, exposes the topsoil to wind and water, leading to severe soil erosion and loss of fertility. Afforestation, the planting of trees in barren areas, increases biomass and helps in carbon sequestration, as trees absorb atmospheric CO2 during photosynthesis, mitigating global warming. Most plastics are synthetic polymers that are non-biodegradable, persisting in the environment for hundreds of years and causing pollution. Thus, statements 1 and 2 are correct.

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