Biology · Science General

Cell Biology and Structure

3,062 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

Genes are located on the _____.

  1. chromosomes

  2. nucleus

  3. cytoplasm

  4. plasma membrane
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genes are segments of DNA that are organized into structures called chromosomes, which are located within the nucleus of eukaryotic cells.

Multiple choice

Double membrane is absent in _____.

  1. chloroplast

  2. lysosome

  3. nucleus

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

Lysosomes are single-membrane-bound organelles containing digestive enzymes. Mitochondria, chloroplasts, and the nucleus are all surrounded by a double membrane.

Multiple choice

Cartilage consists of ______ cells.

  1. osteocyte

  2. leucocyte

  3. chondrocyte

  4. erythrocyte
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chondrocytes are the only cells found in healthy cartilage. Osteocytes are found in bone, and erythrocytes/leucocytes are blood cells.

Multiple choice

The cell division is restricted to ______.

  1. permanent cells

  2. meristematic cells

  3. secretory cells

  4. All the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Meristematic cells are undifferentiated plant cells that are capable of active cell division, unlike permanent cells which have specialized and lost the ability to divide.

Multiple choice

Which of the following statements are TRUE regarding prokaryotic cell? P. Prokaryotic cells are larger in size than eukaryotic cells. Q. Lysosomes are present. R. Site for oxidative phosphorylation is cell membrane. S. Ribosomal subunits are 50S and 30S.

  1. Only P and Q

  2. Only P and S

  3. Only Q and R

  4. Only Q and S

  5. Only R and S
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Yes, both are true. Site for oxidative phosphorylation in prokaryotic cells is cell membrane. Cytoplasmic ribosome size of prokaryotic cells is 70S. Ribosomal subunits are 50S and 30S.

Multiple choice

Match the entries in List I (Cell organelle) and List II (Discoverer)

 
List - I
List - II
P. Chondriosomes 1. R. Altman
Q. Centrosome 2. Edouard Van Beneden
R. Microtubules 3. De Robertis and Franchi
S. Vacuoles 4. Antony van Leeuwenhoek

  1. P - 1, Q - 2, R - 3, S - 4

  2. P - 2, Q - 1, R - 4, S - 3

  3. P - 2, Q - 3, R - 4, S - 1

  4. P - 3, Q - 2, R - 4, S - 1

  5. P - 4, Q - 2, R - 3, S - 1
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, it is correct. Mitochondria, at times referred to as chondriosomes, were discovered by R. Altman. Centrosome was discovered by Edouard Van Beneden. Microtubules were first discovered by De Robertis and Franchi. Vacuoles are believed to have been discovered by Antony van Leeuwenhoek.

Multiple choice

Which of the following statements is/are FALSE regarding mitochondria?

  1. Mitochondria are a cell organelle which has electrons transport system.
  2. Synthesis of ATP in mitochondria takes place at the cristae.
  3. The enzymes for Kreb’s cycle in mitochondria are located in perimitochondrial space.

  1. Only 1

  2. Only 2

  3. Only 3

  4. Only 1and 2

  5. Only 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is a correct answer, as statement 3 is false. The enzymes for Kreb’s cycle in mitochondria are located in mitochondrial matrix.