Tag: membrane bound organelles

Questions Related to membrane bound organelles

Centromere is required for -

botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

  1. Movement of chromosomes towards poles

  2. Cytoplasmic cleavage

  3. Crossing over

  4. Transcription

Show answer
Correct Option: A
Explanation:

Centromere is present in every cell. It is a specific DNA sequence in a chromosome. It is specifically useful in the process of cell division. During mitosis, the spindle fibres attach to the centromeres via kinetochore and all the chromosomes are arranged in an equatoral plane. After this, the chromosomes move towards their respective poles and cell division takes place.

So, option A is the correct answer.

Which chromosome does not provide attachment site for spindle fibers?

botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

  1. Acrocentric

  2. Metacentric

  3. Submeta centric

  4. Acentric

Show answer
Correct Option: A
Explanation:
A chromosome in which the centromere is located quite near one end of the chromosome is called the acrocentric chromosome. Humans normally have five pairs of acrocentric chromosomes. Down syndrome is caused by an extra acrocentric chromosome (chromosome21). The acrocentric chromosome does not provide the attachment site for spindle fibers because centromere is located quite near one end of the chromosome.
So, the correct answer is 'Acrocentric'.

Major constituent of latex is

botany cell structure and organization membrane bound organelles cell: size and differentiation microscopy

  1. Alkaloid

  2. Rubber

  3. Pigments

  4. Salts

Show answer
Correct Option: B
Explanation:

Latex is a miliky, white emulsoin, composed with 30-40% rubber particles, 55-65% water, and small amounts of protein, sterol glycosides, resins, ash, and sugars. Natural rubber latex consists of particles of rubber hydrocarbon and nonrubber substances dispersed in an aqueous serum phase.


So the correct option is 'Rubber'.

Name the part of the cell that stores vital substances.

botany cell structure and organization membrane bound organelles cell: size and differentiation microscopy

  1. Mitochondria

  2. Vacuoles

  3. Plastid

  4. Golgi apparatus

Show answer
Correct Option: B
Explanation:

Mitochondria produces the energy currency, i.e., ATPs of the cell. Mitochondria take nutrients and convert them into energy molecules. This process is known as 'oxidative phosphorylation'. 
Plastids are present in plant cells, which synthesize and store important chemical compounds used by the cell. 
Golgi apparatus has the main function of modifying, sorting and packaging the proteins, which are synthesized by cells. Golgi bodies are also involved in the transport of lipid molecules across the cell. 

Vacuoles are storage bubbles found in animal and plant cells but bigger in plant cells. These are used for storage of food, water and many other vital substances. Thus, the correct answer is option B.

Centromere is required for 

botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

  1. Transcription

  2. Crossing over

  3. Cytoplasmic cleavage

  4. Movement of chromosomes towards poles

Show answer
Correct Option: D
Explanation:

The late prophase or metaphase chromosome has two similar threads or chromatids attached to each other by a narrow non stainable area called as centromere. The two parts of the chromatids on either side of centromere are called as arms. Centromeres bind to spindle fibres and help in movement of chromosomes to opposite poles.

A part of the cell which contains all organelles excluding nucleus is 

biology organisation of the organism membrane bound organelles cell: size and differentiation microscopy

  1. cytoplasm

  2. nucleoplasm

  3. protoplasm

  4. stroma

Show answer
Correct Option: A

All of the following are functions of vacuole, except

botany cell structure and organization membrane bound organelles cell: size and differentiation microscopy

  1. Maintains turgor of plant cells

  2. Provide aqueous environment for accumulation

  3. Play a role in growth by elongation of cells

  4. None of the above

Show answer
Correct Option: D
Explanation:

A plant cell is characterised by a single large sap vacuole. They enclose sap or water with dissolved inorganic and organic substances. It is surrounded by a membrane called as tonoplast. Plant cell vacuole maintains osmotic pressure for turgidity and osmosis. They also store useful as well as waste substances. The growth in terms of increase in size depends on the elongation of the cell. For elongation of the cell, the protoplasm needs to push against cell wall from inside. The generation of pushing force depends on the osmotic pressure created by substances stored in central vacuole. Thus, the correct answer is option D.

Which cell organelle is absent in the leaves of onion?

biology organisation of the organism membrane bound organelles cell: size and differentiation microscopy

  1. Nucleus

  2. Cell wall

  3. Centriole

  4. Endoplasmic reticulum

Show answer
Correct Option: A

Select the set of cell organelles that are the part of endomembrane system:
(i) Endoplasmic reticulum
(ii) Golgi body
(iii) Mitochondria
(iv) Chloroplast
(v) Microbodies
(vi) Lysome
(vii) Vacuole.

biology organisation of the organism membrane bound organelles cell: size and differentiation microscopy

  1. i, ii, iii, v, vi

  2. i, iv, vi, vii

  3. ii, v, vi, vii

  4. i, ii, vi, vii

Show answer
Correct Option: A

Kinetochore is the

botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

  1. Fibrous granular structure within centromere.

  2. Protein disc near centromere

  3. Construction near chromosome end.

  4. End of chromosome.

Show answer
Correct Option: B
Explanation:
  • The kinetochore is a disc-shaped protein complex associated with the centromere of a chromosome during cell division, to which the microtubules of the spindle attach.
  • It forms on a chromatid during cell division.
  • Hence Kinetochore is the protein disc near the centromere.
  • So, the correct answer is 'Protein disc near centromere'.