Unit 3: Cell Structure and Function — Online MCQ Test
BIOLOGY · NEET (All) · NEET
Practice Unit 3: Cell Structure and Function with a free chapter-wise online MCQ test.
This chapter covers: Cell theory and cell as the basic unit of life; Structure of prokaryotic and eukaryotic cell; Plant cell and animal cell; Cell envelope cell membrane cell wall; Cell organelles-str....
AI-generated questions from basic to board-exam level, with instant results and explanations.
Unit 3: Cell Structure and Function — Important Questions & Answers
Identify the correct statement with regard to G1 phase (Gap 1) of interphase.
- A. Reorganisation of all cell components takes place.
- B. Cell is metabolically active, grows but does not replicate its DNA.
- C. Nuclear Division takes place.
- D. DNA synthesis or replication takes place.
Answer: B. Cell is metabolically active, grows but does not replicate its DNA.
In the G1 phase, the cell is metabolically active and continuously grows, but DNA replication does not occur (it occurs in the S phase).
In the G1 phase, the cell is metabolically active and continuously grows, but DNA replication does not occur (it occurs in the S phase).
Which of the following statements about inclusion bodies is incorrect?
- A. These are involved in ingestion of food particles.
- B. They lie free in the cytoplasm.
- C. These represent reserve material in cytoplasm.
- D. They are not bound by any membrane.
Answer: A. These are involved in ingestion of food particles.
Inclusion bodies in prokaryotes are non-membrane-bound structures used for storage of reserve materials; they are not involved in the ingestion of food particles.
Inclusion bodies in prokaryotes are non-membrane-bound structures used for storage of reserve materials; they are not involved in the ingestion of food particles.
Match the following with respect to meiosis: (a) Zygotene, (b) Pachytene, (c) Diplotene, (d) Diakinesis with (i) Terminalization, (ii) Chiasmata, (iii) Crossing over, (iv) Synapsis.
- A. 1) (iv) (iii) (ii) (i)
- B. 2) (i) (ii) (iv) (iii)
- C. 3) (ii) (iv) (iii) (i)
- D. 4) (iii) (iv) (i) (ii)
Answer: A. 1) (iv) (iii) (ii) (i)
Zygotene involves synapsis (a-iv). Pachytene involves crossing over (b-iii). Diplotene involves chiasmata (c-ii). Diakinesis involves terminalization of chiasmata (d-i).
Zygotene involves synapsis (a-iv). Pachytene involves crossing over (b-iii). Diplotene involves chiasmata (c-ii). Diakinesis involves terminalization of chiasmata (d-i).
The number of protons, neutrons and electrons in Lu, respectively, are:
- A. 104, 71 and 71
- B. 71, 71 and 104
- C. 175, 104 and 71
- D. 71, 104 and 71
Answer: D. 71, 104 and 71
For Lutetium (Lu), atomic number (Z) = 71 (protons = 71, electrons = 71). Mass number (A) = 175. Neutrons = A - Z = 175 - 71 = 104.
For Lutetium (Lu), atomic number (Z) = 71 (protons = 71, electrons = 71). Mass number (A) = 175. Neutrons = A - Z = 175 - 71 = 104.
Which of the following events does not occur in rough endoplasmic reticulum?
- A. Protein glycosylation
- B. Cleavage of signal peptide
- C. Protein folding
- D. Phospholipid synthesis
Answer: D. Phospholipid synthesis
Phospholipid synthesis occurs primarily in the smooth endoplasmic reticulum (SER), not in the rough ER. Protein glycosylation (N-linked), cleavage of signal peptide, and protein folding (with help of chaperones) all occur in the RER lumen.
Phospholipid synthesis occurs primarily in the smooth endoplasmic reticulum (SER), not in the rough ER. Protein glycosylation (N-linked), cleavage of signal peptide, and protein folding (with help of chaperones) all occur in the RER lumen.