The base that pairs with adenine in RNA is: MCQ with Answer and Explanation

The base that pairs with adenine in RNA is:
A. Uracil
B. Thymine
C. Cytosine
D. Guanine
Answer: Option A
Solution (By JKSSB Mock Tests)
In RNA, uracil replaces thymine and pairs with adenine (A-U). In DNA, adenine pairs with thymine. Guanine always pairs with cytosine.

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Practice More Biology Questions

Question #1
The 'master gland' of the human body is the:
A. Thyroid
B. Pituitary
C. Adrenal
D. Hypothalamus

Correct Answer: Option B


Explanation:
The pituitary gland controls many other endocrine glands via tropic hormones (TSH, ACTH, FSH, LH). It is regulated by the hypothalamus. Thus, it is often called the master gland.

This question belongs to: Science Biology
Question #2
The enzyme that breaks down lipids in the small intestine is primarily produced by the:
A. Liver
B. Stomach
C. Salivary glands
D. Pancreas

Correct Answer: Option D


Explanation:
Pancreatic lipase is the major enzyme for fat digestion, secreted by the exocrine pancreas into the duodenum. It hydrolyzes triglycerides into monoglycerides and free fatty acids, aided by bile salts that emulsify fats. Gastric lipase (stomach) plays a minor role. Liver produces bile but not lipase. Salivary glands produce salivary amylase.

This question belongs to: Science Biology
Question #3
The organelle that stores calcium ions in muscle cells is the:
A. Golgi apparatus
B. Mitochondria
C. Nucleus
D. Sarcoplasmic reticulum

Correct Answer: Option D


Explanation:
The sarcoplasmic reticulum is a specialized smooth endoplasmic reticulum in muscle cells that stores and releases calcium ions, which trigger muscle contraction. Mitochondria produce ATP, Golgi processes proteins, nucleus controls gene expression.

This question belongs to: Science Biology