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 purpose of using aseptic techniques in cell culture?

  1. To prevent contamination

  2. To maintain sterility

  3. To ensure cell viability

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

Aseptic techniques are employed in cell culture to prevent contamination, maintain sterility, and ensure cell viability by minimizing the introduction of microorganisms and other contaminants into the culture environment.

Multiple choice

Which of the following is a common method for cell counting in cell culture?

  1. Hemocytometer

  2. Flow cytometry

  3. Spectrophotometry

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

Hemocytometer is a widely used method for cell counting in cell culture, involving the use of a specialized counting chamber to manually count cells under a microscope.

Multiple choice

Which type of stem cells can differentiate into any cell type in the body?

  1. Embryonic stem cells

  2. Adult stem cells

  3. Induced pluripotent stem cells

  4. Mesenchymal stem cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Embryonic stem cells are pluripotent, meaning they can differentiate into any cell type in the body.

Multiple choice

Which of the following is NOT a common type of cell culture medium?

  1. Dulbecco's Modified Eagle Medium (DMEM)

  2. Minimum Essential Medium (MEM)

  3. RPMI 1640 Medium

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

Neurobasal Medium is specifically designed for culturing neurons, while DMEM, MEM, and RPMI 1640 are commonly used for a wide range of cell types.

Multiple choice

What is the primary function of serum in cell culture media?

  1. Providing nutrients

  2. Maintaining pH balance

  3. Buffering capacity

  4. Promoting cell attachment
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Serum is added to cell culture media to provide essential nutrients, growth factors, and hormones that support cell growth and proliferation.

Multiple choice

Which of the following factors is NOT critical for maintaining aseptic conditions during cell culture?

  1. Sterile technique

  2. Laminar flow hood

  3. Autoclaving equipment

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

While antibiotics can be used to prevent bacterial contamination, they are not essential for maintaining aseptic conditions. Sterile technique, laminar flow hood, and autoclaving equipment are crucial for preventing contamination.

Multiple choice

What is the purpose of passaging cells in cell culture?

  1. Maintaining cell viability

  2. Preventing overgrowth

  3. Removing dead cells

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

Passaging cells involves splitting a confluent culture into multiple new cultures. This helps maintain cell viability by preventing overgrowth, removes dead cells, and allows for the expansion of the cell population.

Multiple choice

Which of the following is NOT a common method for cell detachment during passaging?

  1. Trypsinization

  2. EDTA treatment

  3. Mechanical scraping

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

Sonication is not typically used for cell detachment during passaging. Trypsinization, EDTA treatment, and mechanical scraping are more commonly employed methods.

Multiple choice

What is the primary role of a cell culture incubator?

  1. Maintaining temperature

  2. Controlling humidity

  3. Providing CO2

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

A cell culture incubator provides a controlled environment for cell growth by maintaining temperature, humidity, and CO2 levels.

Multiple choice

Which of the following cell culture techniques is commonly used for the expansion of stem cells?

  1. Monolayer culture

  2. Suspension culture

  3. Three-dimensional culture

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

Three-dimensional culture, such as spheroid or organoid culture, is often used for the expansion of stem cells as it better mimics their natural microenvironment and supports self-organization.

Multiple choice

What is the function of a cryopreservation medium in cell culture?

  1. Preventing cell damage during freezing

  2. Maintaining cell viability during storage

  3. Promoting cell growth after thawing

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

Cryopreservation medium contains components that protect cells from damage during freezing, maintain cell viability during long-term storage, and promote cell growth after thawing.

Multiple choice

Which of the following is NOT a common method for cell counting in cell culture?

  1. Hemocytometer

  2. Automated cell counter

  3. Flow cytometry

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

Spectrophotometer is not typically used for cell counting in cell culture. Hemocytometer, automated cell counter, and flow cytometry are more commonly employed methods.

Multiple choice

What is the purpose of using a growth factor in cell culture media?

  1. Stimulating cell proliferation

  2. Inhibiting cell differentiation

  3. Promoting cell migration

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

Growth factors are added to cell culture media to stimulate cell proliferation and support cell growth.

Multiple choice

What is the primary function of a cell culture coating?

  1. Promoting cell attachment

  2. Preventing cell migration

  3. Inhibiting cell proliferation

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

Cell culture coatings are applied to culture surfaces to promote cell attachment and facilitate cell growth.

Multiple choice

What is the purpose of using a cell culture insert in a culture dish?

  1. Increasing the surface area for cell growth

  2. Separating different cell types

  3. Creating a co-culture system

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

Cell culture inserts can be used to increase the surface area for cell growth, separate different cell types, and create co-culture systems.