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

Cells interact with each other through

  1. cell plate

  2. plasmodesmata

  3. Ca-pectate

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

Cells interact with each other through plasmodesmata, which are inter-connecting channels of cytoplasm that connect to the protoplasts of adjacent cells across the cell wall.

Multiple choice

Passage cells are characteristically found in which of the following parts?

  1. Endodermis

  2. Vascular bundles

  3. Pericycle

  4. Cortex

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

The root endodermis is the cylindrical boundary that separates the inner vascular tissue from the outer cortex. It is the innermost layer of cortex formed by compactly arranged barrel-shaped cells. Some of the cells in the endodermis are thin-walled and are known as passage cells. The passage cells allow water to pass into the xylem vessels.

Multiple choice

The cells which form permanent tissues exhibit some special characteristic features. Which of the following features regrading these cells is INCORRECT?

  1. The cells vary in size and shape considerably.

  2. Granular cytoplasm

  3. Every cell accomodaes either one or two large and prominent vacuoles, which are storage bubbles found in cells.

  4. The cell wall may be either thin or thick.

  5. Absence of ergastic substances
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Ergastic substances are virtually present in the form of secretory products or storage products or excretory products.

Multiple choice

The inner wall of guard cell is

  1. thicker than the outer wall

  2. thinner than the outer wall

  3. of same thickness as the outer wall

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

The cell walls of guard cells are unevenly thickened. The inner wall is thicker than the outer wall.

Multiple choice

What is/are epithem?

  1. Epithem are the kidney shaped cells regulating the opening and closing of stomatal aperture.

  2. Epithem are the epidermal cells surrounding the guard cells.

  3. Epithem are the loose tissues present below hydathodes.

  4. Epithem is the watery sap secreted from injured or cut plant.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Epithem are the loose tissues present below the hydathodes.

Multiple choice

Which of the following led to the discovery of lysosomes?

  1. Studies on acid phosphatase

  2. Studies on glucose-6-phosphate

  3. Studies on fructose-6-phosphate

  4. Studies on pyruvate dehydrogenase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Studies on glucose-6-phosphate in 1949 led to serendipitous discovery of lysosomes. 

Multiple choice

Lysosomal enzymes are synthesised in

  1. golgi apparatus

  2. rough endoplasmic reticulum

  3. smooth endoplasmic reticulum (SER)

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

Enzymes of the lysosomes are synthesised in the rough endoplasmic reticulum.