Biology ยท 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

Which of the following is NOT a type of biological membrane?

  1. Plasma membrane

  2. Nuclear membrane

  3. Mitochondrial membrane

  4. Cell wall
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cell walls are not biological membranes but are found in plant cells.

Multiple choice

What is the primary characteristic of stem cells?

  1. Ability to differentiate into various cell types

  2. Rapid cell division

  3. Long lifespan

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

Stem cells are characterized by their ability to differentiate into various specialized cell types, contributing to the development and repair of tissues and organs.

Multiple choice

Which type of stem cells is found in adult tissues?

  1. Embryonic stem cells

  2. Induced pluripotent stem cells

  3. Mesenchymal stem cells

  4. Hematopoietic stem cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mesenchymal stem cells are multipotent stem cells found in adult tissues, including bone marrow, adipose tissue, and umbilical cord blood.

Multiple choice

Which of the following is the process by which cells become specialized?

  1. Differentiation

  2. Metamorphosis

  3. Regeneration

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

Differentiation is the process by which cells become specialized.

Multiple choice

Which of the following is the process by which an organism repairs damaged tissue?

  1. Regeneration

  2. Apoptosis

  3. Senescence

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

Regeneration is the process by which an organism repairs damaged tissue.

Multiple choice

Which of the following is the process by which cells die?

  1. Apoptosis

  2. Senescence

  3. Necrosis

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

Apoptosis is the process by which cells die.

Multiple choice

Which of the following is the process by which cells age?

  1. Senescence

  2. Necrosis

  3. Autophagy

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

Senescence is the process by which cells age.

Multiple choice

Which of the following is the process by which cells die in a non-apoptotic manner?

  1. Necrosis

  2. Autophagy

  3. Mitotic catastrophe

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

Necrosis is the process by which cells die in a non-apoptotic manner.

Multiple choice

Which of the following is the process by which cells die due to a lack of attachment to the extracellular matrix?

  1. Mitotic catastrophe

  2. Anoikis

  3. Pyroptosis

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

Anoikis is the process by which cells die due to a lack of attachment to the extracellular matrix.

Multiple choice

Which theory of aging proposes that aging is caused by the accumulation of damaged molecules and cellular components?

  1. Telomere Theory

  2. Free Radical Theory

  3. Mitochondrial Theory

  4. DNA Damage Theory
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Free Radical Theory suggests that aging is caused by the accumulation of reactive oxygen species (ROS) and other free radicals, which can damage cellular components and lead to cellular dysfunction.

Multiple choice

Which cellular structure is responsible for generating energy in the form of ATP?

  1. Nucleus

  2. Mitochondria

  3. Endoplasmic Reticulum

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

Mitochondria are often referred to as the 'powerhouses of the cell' due to their role in generating ATP, the primary energy currency used by cells.

Multiple choice

Which cellular structure is responsible for packaging and modifying proteins?

  1. Nucleus

  2. Mitochondria

  3. Endoplasmic Reticulum

  4. Golgi Apparatus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Golgi Apparatus is responsible for modifying, sorting, and packaging proteins for transport to their final destinations within the cell or for secretion outside the cell.

Multiple choice

Which cellular process is responsible for removing damaged proteins from the cell?

  1. Autophagy

  2. Apoptosis

  3. Necrosis

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

Autophagy is the process by which damaged proteins and cellular components are degraded and recycled within the cell, contributing to cellular maintenance and longevity.

Multiple choice

Which cellular process is responsible for programmed cell death?

  1. Autophagy

  2. Apoptosis

  3. Necrosis

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

Apoptosis is a regulated form of cell death that occurs in response to various stimuli, such as DNA damage or cellular stress, and plays a role in maintaining tissue homeostasis and preventing the accumulation of damaged cells.

Multiple choice

Which of the following is NOT a type of cytoskeletal filament?

  1. Microtubules

  2. Microfilaments

  3. Intermediate filaments

  4. Actin filaments
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Actin filaments are not a type of cytoskeletal filament, but rather a type of microfilament.