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 biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Longest cells in human body are________.

  1. Nerve cells.

  2. Bone cells.

  3. Leg muscle cells.

  4. Heart muscle cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
ANSWER
The length of the muscle cell is 1-40 micrometers.
Nerve cells possess a cell body and one to many thin, fiber-like axons.
Some nerve cells possess axons as long as 1 meter. 
Therefore, option A is correct.
Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Efficient large-sized cells should be_________.

  1. Elongated.

  2. Branched.

  3. With membrane extensions.

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

To maintain efficiency, large cells often increase their surface-area-to-volume ratio through adaptations like elongation, branching, or membrane extensions (like microvilli), which facilitate better nutrient and waste exchange.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

safranin stains

  1. Thick walled cells

  2. Lignified cells

  3. Suberized cells

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

Safranin is a biological stain composed of azonium compounds, which is utilized to study histology and cytology. In particular, safranin stains lignified tissues like xylem even in the presence of cellulose particles. Fluorescent safranin staining is useful to stain the cell wall of woody plants and produce green or yellow fluorescence in the secondary cell wall and red or orange fluorescence in the middle lamella region under a fluorescent microscope. 

So, the correct answer is option B, Lignified cells. 

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

The longest living cells amongst the following are

  1. RBC

  2. B cells

  3. T cells

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

All cells usually have a fixed life span. The cells divide for a certain period of time, after which they die. This has been explained by the phrase "programmed cell death". The lifespan of each type of the body cells differ and it depends on the function it is destined to perform. Neurons are long lived and are generally non-mitotic. Memory T cells and memory B cells can provide long lasting immunity from exposure to antigens, they too are long lasting but their life span is less than that of a neuron.

The lifespan of RBC is shortest amongst the options which are given, it is 115 days. Thus, the correct answer is option D.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

The largest cell measuring .........., is the egg of an ostrich.

  1. 130 mm-150 mm

  2. 130 mm-180 mm

  3. 130 mm-170 mm

  4. 170 mm-190 mm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cell is the structural unit of life and its size ranges from 0.5 micrometers to 100 micrometers. An egg of ostrich is a single-celled structure and know as the largest cell in the world with the size of 130 mm-170 mm. Thus, the correct answer is option C.

Multiple choice biology locomotion and movement locomotion in animals bones and movements muscle contraction types of muscles muscles

An iron-containing protein myoglobin is present in the

  1. Spleen

  2. Lungs

  3. Muscles

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Myoglobin is the iron and oxygen-binding protein that is found in the muscle tissue of the vertebrates and in almost all mammals. This contains heme, the pigment responsible for the red color of meat.

Therefore, the correct answer is option C.

Multiple choice biomacromolecules biotechnology cell biology and biotechnology biomolecules biology

Which of the following is nucleo-proteinaceous?

  1. Chromosomes, viruses and ribosomes

  2. Centriole, viruses and lysosomes

  3. VIruses, chromosomes and vacuole

  4. Nucleus, GB, DNA
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nucleo-proteinaceous structures are composed of nucleic acids (DNA or RNA) and proteins. Chromosomes (DNA+histones), viruses (DNA/RNA+capsid), and ribosomes (rRNA+proteins) fit this description.

Multiple choice zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

Separated cells of two vertebrates are mixed up. They will

  1. Aggregate species-wise

  2. Aggregate tissue-wise

  3. Aggregate species-wise and then tissue-wise

  4. Aggregate species-wise and then reconstruct the animals.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When dissociated cells from different tissues are mixed, they exhibit selective affinity and re-aggregate based on their tissue type rather than their species origin. This is a classic demonstration of cell-cell recognition and adhesion.