Biology · Science General

Cell Biology and Structure

3,221 Questions

Cell biology focuses on the structure and function of cellular organelles. Key topics include cellular respiration, DNA inheritance, and energy production. These fundamental biology concepts are crucial for medical entrance and state service examinations.

Cell organelles functionsCellular respiration sitesDNA and ribosomesAnimal cell structurePlant cell components

Cell Biology and Structure Questions

Multiple choice

Match the following:

 
a. Plasma membrane 1. are thread-like structures usually present in the nucleus that become visible only during cell division
b. Chromosomes 2. are the dense, spherical and grannular particles which occur freely in the matrix or remain attached to the endoplasmic reticulum
c. Ribosomes 3. is a living, thin, delicate, elastic and selective permeable membrane

  1. a - 3, b - 2, c - 1

  2. a - 1, b - 2, c - 3

  3. a - 1, b - 3, c - 2

  4. a - 2, b - 1, c - 3

  5. a - 3, b - 1, c - 2
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option.

Multiple choice

Match the following:

 
a. Mitochondria 1. consists of a system of membrane-bound vesicles arranged approximately parallel to each other in stacks
b. Lysosomes 2. an organelle in which the biochemical processes of respiration and energy production occur
c. Golgi apparatus 3. are a kind of waste disposal system of the cell that keep the cell clean by digesting any foreign material as well as worn-out cell organelles

  1. a - 2, b - 3, c - 1

  2. a - 2, b - 1, c - 3

  3. a - 1, b - 2, c - 3

  4. a - 3, b - 2, c - 1

  5. a - 1, b - 3, c - 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option.

Multiple choice

Which of the following statements is/are false?

a. In plant cells, a cell wall, composed mainly of cellulose, is located inside the cell membrane. b. Chromoplasts that contain chlorophyll are called chloroplasts and they perform photosynthesis. c. The energy required for various chemical activities needed for life is released by mitochondria in the form of adenosine triphopshate molecules.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. In plant cells, a cell wall, composed mainly of cellulose, is located outside the cell membrane.

Multiple choice

A mixed culture containing caulobacter, campylobacter, citrobacter and corynaebacterium is inoculated in peptone broth containing 0.01% peptone and incubated aerobically. Which of the following bacteria will produce first turbidity in the medium?

  1. Citrobacter

  2. Caulobacter

  3. Campylobacter

  4. Corynaebacterium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Caulobacter naturally lives in dilute aquatic environment. It can grow in the medium with very low levels of carbon and nitrogen. In such minimal media, other bacteria fail to grow and caulobacter grows and produces turbidity.

Multiple choice

Which of the following statements is true about nissil bodies?

  1. It takes part in DNA replication.

  2. It is made up of rough endoplasmic reticulum (RER).

  3. Nissil bodies are involved in transcription.

  4. Nissil bodies are involved in proof reading while DNA replication.

  5. Nissil bodies are made up of golgi bodies.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nissil bodies are made up of rough endoplasmic reticulum.

Multiple choice

Match List I and List II and select the correct answer using the codes given below the Lists: List I List II (Cell organelle) (Function) (a) Endoplasmic Reticulm 1. Degradation of fatty acids and amino acids (b) Mitochondrion 2. Synthesis of glycoproteins and lipids (c) Peroxisome 3. Degradation of worn-out cell constituents (d) Lysosome 4. Energy metabolism

  1. (a) 1 (b) 4 (c) 3 (d) 2

  2. (a) 2 (b) 4 (c) 1 (d) 3

  3. (a) 4 (b) 2 (c) 1 (d) 4

  4. (a) 2 (b) 1 (c) 4 (d) 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Endoplasmic Reticulum synthesizes glycoproteins and lipids (2), Mitochondrion handles energy metabolism via cellular respiration (4), Peroxisomes break down fatty acids and amino acids (1), and Lysosomes degrade worn-out cell constituents through autophagy (3). The correct sequence is (a) 2, (b) 4, (c) 1, (d) 3.

Multiple choice

Cybrids are formed due to

  1. fusion of nuclei

  2. fusion of cytoplasms

  3. fusion of plastids

  4. fusion of mitochondria
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cybrids are formed by fusion of cytoplasms only.