The bond that joins amino acids together in a protein is called a: MCQ with Answer and Explanation

The bond that joins amino acids together in a protein is called a:
A. Peptide bond
B. Glycosidic bond
C. Phosphodiester bond
D. Hydrogen bond
Answer: Option A
Solution (By JKSSB Mock Tests)
A peptide bond is a covalent bond formed between the carboxyl group (-COOH) of one amino acid and the amino group (-NH₂) of another, releasing a water molecule (condensation reaction). Glycosidic bonds link monosaccharides, phosphodiester bonds link nucleotides in DNA/RNA, hydrogen bonds stabilize secondary structures. Peptide bonds create the polypeptide backbone.

Discuss this Question (0)

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

Practice More Biology Questions

Question #1
The edible part of a pine seed is:
A. Female gametophyte (haploid tissue)
B. Perisperm
C. Cotyledons
D. Endosperm

Correct Answer: Option A


Explanation:
In gymnosperms like Pinus, the female gametophyte develops within the ovule and serves as the nutritive tissue for the developing embryo. Unlike angiosperms, where the nutritive tissue is the triploid endosperm formed after double fertilization, the gymnosperm nutritive tissue is haploid and forms before fertilization. Therefore, the edible part of a pine seed is the haploid female gametophyte.

This question belongs to: Science Biology
Question #2
The tissue responsible for the transport of water in plants is:
A. Xylem
B. Phloem
C. Collenchyma
D. Epidermis

Correct Answer: Option A


Explanation:
Xylem is a complex permanent tissue that conducts water and dissolved minerals from roots to the aerial parts. It consists of tracheids, vessels, xylem parenchyma, and fibers. Phloem transports organic solutes, collenchyma provides flexible support, epidermis protects.

This question belongs to: Science Biology
Question #3
Which of the following is NOT a plant hormone?
A. Auxin
B. Thyroxine
C. Cytokinin
D. Gibberellin

Correct Answer: Option B


Explanation:
Thyroxine is an animal hormone secreted by the thyroid gland, regulating metabolism. Auxin, gibberellin, cytokinin, abscisic acid, and ethylene are plant hormones (phytohormones). Plant hormones control growth, development, and responses to environment. Thyroxine contains iodine and affects basal metabolic rate. Thus, thyroxine is unrelated to plant physiology.

This question belongs to: Science Biology