Biology ยท 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

What is the name of the process by which cells take in nutrients from their surroundings?

  1. Endocytosis

  2. Exocytosis

  3. Phagocytosis

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

Endocytosis is the process by which cells take in nutrients from their surroundings. It is a complex process that involves the formation of vesicles that engulf the nutrients and transport them into the cell.

Multiple choice

What is the name of the process by which cells communicate with each other?

  1. Signaling

  2. Transduction

  3. Reception

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

Signaling is the process by which cells communicate with each other. It involves the release of chemical messengers, called signaling molecules, that bind to receptors on the surface of target cells and trigger a cellular response.

Multiple choice

What is the function of proteins in cells?

  1. They carry out cellular functions.

  2. They regulate gene expression.

  3. They provide structural support.

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

Proteins carry out cellular functions, regulate gene expression, and provide structural support. They are essential for all living organisms.

Multiple choice

Which type of fossil is formed when an organism's soft parts are preserved?

  1. Cast

  2. Mold

  3. Petrified

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

Trace fossils are formed when an organism's activities, such as footprints or burrows, are preserved in the Earth's crust.

Multiple choice

Which type of fossil is formed when an organism's soft parts are preserved in a mineralized form?

  1. Cast

  2. Mold

  3. Petrified

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

Soft parts of organisms are rarely preserved as fossils due to their delicate nature and susceptibility to decay.

Multiple choice

What is the term for the process by which cells become specialized in structure and function?

  1. Differentiation

  2. Proliferation

  3. Migration

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

Differentiation is the process by which cells become specialized in structure and function, forming different tissues and organs.

Multiple choice

What is the term for the process by which a cell commits to a specific fate and loses the ability to become other cell types?

  1. Differentiation

  2. Proliferation

  3. Migration

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

Determination is the process by which a cell commits to a specific fate and loses the ability to become other cell types, marking the beginning of differentiation.

Multiple choice

What is the term for the process by which a cell undergoes programmed cell death?

  1. Differentiation

  2. Apoptosis

  3. Migration

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

Apoptosis is the process by which a cell undergoes programmed cell death, eliminating unwanted or damaged cells during development and maintaining tissue homeostasis.

Multiple choice

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

  1. Amnion

  2. Chorion

  3. Allantois

  4. Yolk sac
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The yolk sac is not an embryonic membrane, but rather a structure that provides nutrients to the developing embryo.

Multiple choice

What is the name of the molecule that carries high-energy electrons from the electron transport chain to NADH?

  1. FADH2

  2. NADH

  3. ATP

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

FADH2 is the molecule that carries high-energy electrons from the electron transport chain to NADH. It is produced during the oxidation of fatty acids and other organic molecules.

Multiple choice

What is the name of the molecule that carries high-energy electrons from the electron transport chain to cytochrome c?

  1. NADH

  2. FADH2

  3. ATP

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

Cytochrome c is the molecule that carries high-energy electrons from the electron transport chain to cytochrome c oxidase. It is a small, heme-containing protein that is located in the intermembrane space of mitochondria.

Multiple choice

What is the name of the molecule that carries high-energy electrons from the electron transport chain to oxygen?

  1. NADH

  2. FADH2

  3. ATP

  4. Cytochrome c oxidase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cytochrome c oxidase is the enzyme that catalyzes the transfer of electrons from cytochrome c to oxygen. This reaction is the final step of the electron transport chain and results in the production of water.

Multiple choice

What is the name of the molecule that carries high-energy electrons from the electron transport chain to FADH2?

  1. NADH

  2. FADH2

  3. ATP

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

NADH is the molecule that carries high-energy electrons from the electron transport chain to FADH2. It is produced during the oxidation of glucose and other organic molecules.

Multiple choice

Which of the following is NOT a type of cell?

  1. Prokaryotic cell

  2. Eukaryotic cell

  3. Animal cell

  4. Plant cell

  5. Bacterial cell
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Bacterial cell is not a type of cell, although it is a type of prokaryotic cell.

Multiple choice

Which of the following is a type of cell-cell adhesion molecule that mediates cell-cell recognition and adhesion in immune responses?

  1. Integrins

  2. Cadherins

  3. Selectins

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

Selectins are cell adhesion molecules expressed on the surface of immune cells and endothelial cells. They play a crucial role in the initial attachment and rolling of leukocytes on the endothelium during immune responses.