Biology · 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

Which of the following are the elongated cells with tapering ends?

  1. Vessels

  2. Sclereids

  3. Tracheids

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

Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. Tracheids are one of two types of tracheary elements, vessel elements being the other.

Multiple choice

Which is the longest cell of an animal's body?

  1. Lymphocyte

  2. Neuron

  3. Osteocyte

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

Neuron is the longest cell of an animal's body. A neuron is an electrically excitable cell that processes and transmits information through electrical and chemical signals.

Multiple choice

Krebs' cycle occurs in

  1. cytoplasm

  2. mitochondria

  3. chloroplast

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

Krebs' cycle occurs in the mitochondria.

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

Which is a collared cell

  1. Scieroblast

  2. Silicoblast

  3. Chromocyte

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

Choanocytes (also known as "collar cells") are cells that line the interior of asconoid, syconoid and leuconoid body type sponges.

Multiple choice

Sex pili are present in

  1. Nucleus

  2. Cell wall

  3. Gram +ve and Gram -ve

  4. Method of nutrition
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A fine, filamentous appendage found on the cell surface of many gram-negative bacteria, shorter, thinner and straighter than flagella

Multiple choice

Acrosome is made up of

  1. Mitochondria

  2. Centrioles

  3. Golgi bodies

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

Acrosome is a cap-like structure derived from the Golgi apparatus.

Multiple choice

In a human cell, Kreb's cycle occurs in

  1. cytosol

  2. mitochondrial matrix

  3. inner mitochondrial membrane

  4. inter membrane space
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Kreb's cycle occurs with in the mitochondrial matrix in all eukaryotic cells.