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Cell: Unit of Life (Class - XI)

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Which of the following statements is not true about cell theory?

  1. The bodies of all living beings are made up of cells and their products.

  2. Cells are the structural units in the body of a living organism.

  3. Every cell is made up of a small mass of protoplasm having nucleus.

  4. All organelles of cell can survive individually.


Correct Option: D
Explanation:

A cell can survive independently but not its organelles.

Which of the following pairs of scientist and discovery is incorrectly matched?

  1. Meischer - Nucleotides

  2. Holler et al - Structure of tRNA

  3. Nageli and Cramer - Cell membrane

  4. Robert Brown - Nucleus


Correct Option: A
Explanation:

Nucleotides of DNA were first discovered by Oswarld Avery.

The role of the nucleus in regulating the phenotype of plant was discovered in

  1. maize

  2. Neurospora

  3. Acetabularia

  4. pea


Correct Option: C
Explanation:

The control of nuclei over the phenotypic expression of the cell was studied in Acetabularia.

The in-foldings of the inner mitochondrial membrane are called

  1. cristae

  2. oxysomes

  3. grana

  4. cisterns


Correct Option: A
Explanation:

Cristae are the folded structures that are formed by the in-foldings of inner mitochondrial membrane.

Which of the following cell organelles is/are semi-autonomous?

  1. Mitochondria

  2. Ribosomes

  3. Endoplasmic reticulum

  4. Golgi bodies


Correct Option: A
Explanation:

They are semi-autonomous.

Which of the following cell organelles is/are associated with photorespiration?

  1. Peroxisome

  2. Glyoxysome

  3. Mesosome

  4. All of the above


Correct Option: A
Explanation:

Peroxisome is associated with photorespiration. Peroxisome is a kind of microbody. Peroxisome contains a typical enzyme involved in glycolate metabolism and photorespiration.

Fluid mosaic model was proposed by

  1. J. David Robertson

  2. Danielli and Davson

  3. Singer and Nicolson

  4. Nageli and Cramer


Correct Option: C
Explanation:

They presented the most recent model of biomembrane, according to which, membranes do not have a uniform diposition of lipids and proteins, but a mosaic of two.

Grana are a part of

  1. mitochondria

  2. chloroplasts

  3. aleurone grains

  4. starch grains


Correct Option: B
Explanation:

Chloroplasts contain grana, which are minute particles consisting of a pile of thin double platelets, containing chlorophylls and carotenoids associated with photosynthesis.

Extra nuclear DNA is present in

  1. ribosome

  2. chloroplast

  3. golgi body

  4. ER


Correct Option: B
Explanation:

Chloroplast is a semi-autonomous cell organelle, which contains its own DNA and protein-synthesising machinery.

The shape of the chromosome is determined by

  1. centromere

  2. telomere

  3. centrosphere

  4. chromomere


Correct Option: A
Explanation:

It is the structure in the chromosome which gives it shapes like I, V, L, etc.

Most abundant elements in a living cell are

  1. C, O, H and N

  2. C, O, S and P

  3. C, O, N and S

  4. C, O, H and P


Correct Option: A
Explanation:

 Most abundant elements in a living cell are C, O, H and N.

Compound which acts as a reservoir of phosphate-bond energy in the cell is

  1. phosphagen

  2. plastogen

  3. carcinogen

  4. plastocin


Correct Option: A
Explanation:

 Compound which acts as a reservoir of phosphate-bond energy in the cell is phosphagen.

Which of the following cell structures is/are associated with oxidative phosphorylation?

  1. Grana

  2. Oxisomes

  3. Ribosomes

  4. Endoplasmic reticulum


Correct Option: B
Explanation:

They are associated with mitochondria and take part in aerobic respiration.

Which of the following organelles are aassociated with digestive enzymes?

  1. Ribosomes

  2. Lysosomes

  3. Peroxisomes

  4. Chromosomes


Correct Option: B
Explanation:

They contain digestive enzymes like hydrolase.

The 'fluid mosaic' model of cell membrane states that

  1. a lipid bilayer has proteins embedded in itself and none on the surface

  2. a lipid bilayer has some embedded proteins and some proteins on the surface

  3. a lipid bilayer is coated by a layer of proteins on each face

  4. a lipid bilayer is coated by a layer of proteins on the outer face only


Correct Option: B
Explanation:

It states that a lipid bilayer has some embedded proteins and some proteins on the surface.

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