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 botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

Division of cells and tissues is an important factor for establishing a multicellularity in an organism.

  1. True

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

In multicellular organisms, most of the tissue of the body is growing by increasing their cell number (means of cell division), but their growth is strictly regulated to maintain a balance between different tissue. Thus, the correct option is A.

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

Consider the following feature of tissues.

A. They are similar and dissimilar cells.
B. They are performing a common function.
C. They have a common origin.
D. They are characterized by the distinct cell wall.

The correct ones are grouped in

  1. A, B and D

  2. B, C and D

  3. A, B and C

  4. A, C and D
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • A tissue is the group of cells of the common origin that are structurally similar or sometimes dissimilar and perform a particular function. 
  • Only plant cells are characterized by the distinct cell wall and absent in animal cells.

Therefore, the correct answer is option C.

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

The groups of cells which perform a particular function are called as 

  1. Tissue

  2. Organ

  3. Organ system

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

A tissue is the group of cells of the common origin which are structurally similar and perform a particular function. Whereas organ is the group of tissues and organ system is the group of organs which performs different functions. The molecule is the smallest part of the cell and different molecule performs different functions.

Therefore, the correct answer is option A.

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

 Tissue is formed by the combination of 

  1. Organs

  2. Organ systems

  3. Cell

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

A tissue is the group of cells of the common origin which are structurally similar and perform a particular function. Whereas organ is the group of tissues and organ system is the group of organs which performs different functions.

Therefore, the correct answer is option C.

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

Tissues losing their ability to divide define 

  1. Histological differentiation

  2. Cellular differentiation

  3. Molecular differentiation

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The meristematic tissues are the dividing tissues but when they lose the ability to divide they become permanent tissues. This process of taking up a permanent shape, size and function are called cellular differentiation. 
  • There are 3 types of permanent tissues: simple permanent tissues, complex permanent tissues, special or secretory tissues. So option B is correct.
Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

A cellular organization between a single cell and a complete organism is controlled by

  1. Organs

  2. Tissues

  3. Enzymes

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

A cellular organization between a single cell and a complete organism is controlled by the tissue. They are the collection of similar cells, with specific function. A collection of tissue gives rise to an organ. A tissue is a simple, which may be single celled type or a complex cell type. Proteins and enzymes are not the organization of cells. So, option B is correct.

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

Passage cells are found in

  1. Epidermis

  2. Endodermis

  3. Pericycle

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

In terrestrial plants, the endodermis is the central, innermost layer of cortex, made up of compact living cells surrounded by an outer ring of endodermal cells. It is the boundary between the cortex and the stele and contains the passage cells which allows some symplastic flow to the inside. Thus, the correct answer is option B.

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

Compound tissue is defined as.

  1. Similar types of cells held together by connective tissue

  2. Different types of cells which are different in structure and function

  3. Different types of cells performing one function

  4. Similar cells at different regions performing many functions
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A compound tissue (or complex tissue) consists of more than one type of cell working together to perform a common function, such as xylem or phloem in plants.

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

Histology is study of

  1. Tissues

  2. Cells

  3. Structures discernible with naked eyes

  4. Changes in form and structure during development
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  1. Cytology is the branch of biology that deals with the structure of a cell.
  2. Histology is the branch of biology that deals with the study of microscopic anatomy or tissue.
  3. Morphology is the study of structure discernible with a naked eye.
So the correct option is 'Histology'

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

State whether the following statements are true or false.
An extracellular matrix helps some cells to adhere to neighbouring cells.

  1. True

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

Extracellular matrix is the network of macromolecules like collagen, enzymes etc, which provide structural support to the cells. They help in the formation of tissues and organs. Extracellular matrix functions as cell adhesive as they are helpful in the interaction between cells and matrix.

So, the correct statement is 'True'.

Multiple choice botany plant tissues introduction to tissue tissues - "the teams of workers" introduction to tissues

We do not sense any pain when we clip our nails or cut our hair. Why?

  1. They are made up of dead cells.

  2. These parts are senseless.

  3. They are very strong to tolerate pain.

  4. None of these.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Hairs and nails are made of dead tissues. Only the base of the hair and the base of the nail are living. 
  • The dead tissues are devoid of the nerve supply which acts as messengers to convey the sensation of pain and in their absence, it cannot be perceived by our brain. 

  • Thus, the correct answer is option A.
Multiple choice cancer - causes, signs and diagnosis human health and diseases zoology

Cancer treatment is a difficult process. Which of the following is a reason for it?

  1. Cancer call can undergo uncontrolled division.

  2. Cancer cells adapt and evolve in response to treatment.

  3. Cancer cells become unresponsive to growth signals.

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Cancer cells divide uncontrollably and exhibit properties such as loss of contact inhibition and loss of anchorage dependence which can also make them break away from the original site and travel to distant places in the body where they can begin forming a new cancer. This property is called as metastasis. Hence, treatment of cancer is a difficult process. Cancer cells become unresponsive to anti-growth signals which makes them grow uncontrollably.
So, the correct answer is, 'Cancer cell can undergo uncontroled division'.
Multiple choice zoology movement and locomotion in man structure of skeletal muscle muscles and their structure skeletal muscles

An animal cell with numerous nuclei is called

  1. Coenocyte

  2. Syncytial

  3. <p>Plasmodium</p>

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Syncytial refers to a multinucleate condition where a single cell has more than one nucleus per cell i.e., multiple nuclei with a common cytoplasm.
  • It is caused primarily due to multiple cell fusions of uninuclear cells.
  • This condition usually arises when cells are infected with certain types of viruses (HIV, pneumoviruses etc.).
  • In animals, this condition is seen in skeletal muscles (large skeletal muscle fibres are formed by the fusion of individual muscle cells).
  • So, the correct answer is 'Syncytial'.
Multiple choice biology animal tissue muscular tissues muscle tissue muscle tissues

The cytoplasm of a muscle cell is known as

  1. Neuroplasm

  2. Sarcolemma

  3. Axoplasm

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

Sarcoplasm is the cytoplasm of muscle cells or myocytes. Large amounts of glycosomes and significant amounts of myoglobin are usually found in the sarcoplasm.

So, the correct answer is 'Sarcoplasm'.