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

What is the best way to rephrase the following sentence?

In which of the following organism the cell organelles have protective covering?

  1. In which of the following organism, does the cell organelle have protective covering?

  2. In which of the following organisms the cell organelle has protective covering?

  3. In which of the following organisms, do the cell organelles have protective covering?

  4. No improvement needed
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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Multiple choice

Why do golgi bodies have connections with the membranes of ER?

  1. To prevent the membranes from mechanical injury

  2. To store and dispatch the materials synthesised by ER

  3. To form lysosomes in ER

  4. To transport ribosomes into ER
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The main function of golgi body is to store and dispatch the materials synthesised by ER.

Multiple choice

Which of the following structures is/are found only in the perikaryon of neuron?

  1. Microtubules

  2. Neurofilaments

  3. Mitochondria

  4. Nissl bodies

  5. Golgi apparatus
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The golgi apparatus is a stack of flattened compartments where molecules are packaged for delivery to other cell components or for secretion from the cell. It is present only in the cell body or soma of neuron. It is present close to the nucleus and is absent in axon and dendrites.

Multiple choice

The soma or perikaryon or cyton is the bulbous end of a neuron containing the cell nucleus. Nissl body, also known as nissl or tigroid substance, a large granular body found in the cyton or dendrites of neurons is:

  1. erythrocyte

  2. WBC

  3. eosinophil

  4. thrombocyte

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

Erythrocytes, also known as red blood cells (RBCs), function to transport oxygen in the blood. Mammalian erythrocytes are typically shaped as biconcave disks that are flattened and depressed in the center with a dumbbell shaped cross section and a torus shaped rim on the edge of the disk. Oxygen transport is efficient because the cells have a flattened disc shape to increase surface area allowing rapid diffusion of oxygen, and they contain haemoglobin which absorbs oxygen in the lungs and releases oxygen in the rest of the body.

Multiple choice

The cells responsible for maintaining the blood brain barrier forming a 3-D framework for the central nervous system and including the repair work in damaged neural tissue are ________.

  1. stem cells

  2. ependymal cells

  3. astrocytes

  4. oligodendrocytes

  5. glial cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Astrocytes have many cytoplasmic processes terminating on blood vessels. These cells are engaged in all essential CNS functions including blood flow regulation, maintaining the blood brain barrier, energy metabolism, ion and water homeostasis, immune defence of the body, etc.

Multiple choice

What is true about EMEM with respect to tissue culture?

  1. It contains amino acids, salts, glucose and vitamins and is used to maintain cells in tissue culture.

  2. It contains amino acids, alkalies and minerals and is used to maintain temperature in tissue culture.

  3. It contains organic acids and is used to multiply cells.

  4. It contains acids, salts, glucose and fructose and is used to generate epithelial cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Eagle's minimal essential medium (EMEM) is a cell culture medium developed by Harry Eagle that can be used to maintain cells in tissue culture. It contains amino acids, salts (calcium chloride, potassium chloride, magnesium sulfate, sodium chloride, and monosodium phosphate), glucose, vitamins (folic acid, nicotinamide, riboflavin, B12). 

Multiple choice physics current electricity electric cells and batteries

Primary cells are

  1. Recyclable

  2. Use and throw

  3. Rechargable

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

Primary cells are use and throw. They are not recyclable since structure is carefully packed. They are not rechargable since chemical reactions involved are not recyclable. 

Multiple choice physics current electricity electric cells and batteries

Primary cells have _____ resistance and secondary cells have ______ resistance

  1. Low , High

  2. High, Low

  3. Low , Low

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

Primary cells have high internal resistance while secondary cells have low internal resistance.

Multiple choice physics current electricity electric cells and batteries

The primary cell which is used in daily life is-

  1. Leclanche cell

  2. Dry cell

  3. Daniel cell

  4. Simple voltaic cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Commonly used cell is dry cell.

Dry-cell is essentially comprised of a metal electrode or graphite rod {elemental carbon} surrounded by a moist electrolyte paste enclosed in a metal cylinder. in most common type of dry cell battery the cathode u=is composed of a form of elemental carbon called graphite.

Multiple choice physics current electricity electric cells and batteries

Cell which cannot be charged is 

  1. Primary cell

  2. Secondary cell

  3. Electrochemical cell

  4. None of the above

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A primary cell cannot be charged whereas secondary and electrochemical cell can be recharged.charging of a cell depends upon cell reaction is either reversible or irreversible . when reaction is irreversible then cell can not be charge after one time discharge.