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 botany caskets of life the cell structure multicellular organisms number and shape of cells

Identify the unicellular organism.

  1. Algae

  2. Amoeba

  3. Snail

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

Some living organisms are made up of once cell only, these are called unicellular. These organisms have a large surface area to volume ratio and rely on simple diffusion to meet their needs. An example of a unicellular animal is Amoeba. Amoeba feed on smaller organisms such as bacteria.

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Which of the following characteristics concludes that Amoeba is a unicellular animal?

  1. It is able to move.

  2. It has a single cell.

  3. It lacks specialized organs for various function.

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Amoeba is unicellular because it consists of a single cell (B) and lacks specialized organs (C), performing all life processes within that single cell.

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Paramoecium is a multicellular animal.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The organisms can be broadly classified into two groups, namely unicellular organisms and multicellular organisms depending upon the number of cells. Unicellular organisms are made up of only one single cell. Examples include Amoeba, Paramecium, yeast, bacteria. Multicellular organisms are those organisms that are made up of more than one cell. Examples include human beings, animals.

Hence the statement paramoecium is a multicellular animal is false. 

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Cells are composed of highly independent and randomly interacting components.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The cell is a basic biological unit of living organisms.

A cell contains different membrane-bound organelles which are structural and functional units constructed from several macromolecules bonded together.A typical animal cell contains, the nucleus which possesses genetic material DNA, mitochondria to generate energy, nucleolus in the nucleus to produce ribosomes, ribosomes to produce proteins and endoplasmic reticulum which packages and transports proteins, sugars and lipids to Golgi bodies to distribute them through lysosomes to different parts of the cell. All organelles are anchored in cytoplasm of the cell and work in harmony with each other.
Therefore the option B is correct.

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Name the kinds of cells found in the following places:

  1. Surface of the human skin

  2. Salivery gland

  3. Brain

  4. Inner lining of the wind pipe
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

A. merkel cells, keratinocytes, melanocytes andLangerhans cells.

B.epithelial cells, mucous cells.

C. astrocytes, oligodendrocytes andependymal cells.

D. goblet cells, columnar epithelial cells.

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Which of the following cells can be seen with a naked eye?

  1. Egg cell of a hen

  2. Neurons of a giant squid

  3. Cells of the elephant's brain

  4. No single can be seen with a naked eye
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In all mammals, the ovum is fertilized inside the female body. typically visible to the naked eye without the aid of a microscope.

So, the correct option is 'Egg cell of a hen'.

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Which  is the correct order for levels of organization in humans

  1. Cell $\rightarrow$ Tissue$\rightarrow$Organ$\rightarrow$Organ system$\rightarrow$Organism
  2. Cell$\rightarrow$Organ$\rightarrow$Organ system$\rightarrow$Organism
  3. Cell$\rightarrow$Tissue$\rightarrow$Organ$\rightarrow$Organism
  4. Cell$\rightarrow$Tissue$\rightarrow$Organism
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cells are grouped into tissues, tissues are grouped into organs, different organs are grouped into organ systems and many organ systems come together to form complex organisms like human beings.

Multiple choice botany caskets of life the cell structure multicellular organisms number and shape of cells

Cells are autonomous because

  1. They synthesise components of living protoplasm from non living materials.

  2. They are able to grow and divided.

  3. Each cell has its own life span.

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

Cells are autonomous which means they are self contained. They are able to carry out their own activities independently for their survival. They are able to synthesis protoplasmic components of a cell from non living matter such as simple organic compounds. They are able to divide into daughter cells as they are capable of producing energy, exchange of gases and replication of genetic material required for division. Every such cell has a limited life span as it grows, divide and then later die but the other cells surrounding that cell may be in a different state of growth. Hence, option D is correct. 

Multiple choice biology the world of microbes protista protozoa five kingdoms of living organisms

Water collecting canals around the contractile vacuole are called _________.

  1. Incurrent canals

  2. Excurrent canals

  3. Radiating canals

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

Water collecting canals around the contractile vacuole are called Radiating canals The contractile vacuole is the part that contracts and forces extra water out of the cell. The radiating canals are the paths to the contractile vacuole. In Paramecium, these are two contractile vacuoles while one in Amoeba.

Multiple choice biology the world of microbes protista protozoa five kingdoms of living organisms

Macronucleus of Paramecium takes part in

  1. Transmission of hereditary characters

  2. Controlling normal cellular metabolism

  3. Production of variations and adaptability

  4. All the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Paramecium has two types of nucleus- micronucleus and macronucleus. Macronucleus perform common cellular functions and micronucleus takes part in sexual reproduction. 
Thus, the correct answer is option (B).
Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

The most common type of tapetum is?

  1. Secretary or glandular type

  2. Amoeboid or invasive type

  3. Nonglandular and noninvasive type

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

Amoeboid or Invasive is also known as Periplasmodial Tapetum. It is the most common type of tapetum in the angiosperms. This type of tapetum can be seen in Alisma, Butomus, Tradescantia and Typha, etc. The tapetal cells fuse among themselves to make the tapetal periplasmodium. The protoplast of the fused tapetal cells then moves into the locule. This protoplast movement into the locule, may take place during meiotic prophase.

Thus the correct option is B.

Multiple choice muscle contraction locomotion and movements biology

Which cell organelle is associated with muscle contraction by release and uptake of $Ca^{2+}$ ions?

  1. Golgi apparatus

  2. RER

  3. Sarcoplasmic reticulum

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

SER is associated with muscle contraction by release and uptake of Ca ions because SER functions as the packaging structure which stores the Ca ions until its release.

So, the correct option is 'SER'.

Multiple choice bio-chemistry cell biology cytoplasm the components in a cell component of the cell

Which part of the cell is wrongly matched with its function?

  1. Nucleus controls the activities of the cell

  2. Cytoplasm makes chlorophyll in green plants

  3. Cell wall protects a plant cell

  4. Cell membrane lets water and gas in and out of the cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The nucleus contains the genetic material of the cell and thus regulates all the activities of the cell.

Cytoplasm is the fluid present in the cell. It is present between plasma membrane and nucleus. it helps to maintain the shape of the cell and helps in distribution of cellular materials inside the cell.
Cell wall is a rigid covering mainly present in plant and bacterial cell and provides protection to the plant cell.
Cell membrane is a semipermeable membrane and it regulates the entry and exit of the molecules.
So, the correct answer is option B.