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Cell: The Unit of Life - 1

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Which of the following organisms is/are not unicellular?

  1. Paramecium

  2. Diatoms

  3. Cyanobacteria

  4. Chlamydomonas


Correct Option: D
Explanation:

Fungi is a multicellular eukaryotic organisms.

The shape and size of a cell is related to its

  1. appearance

  2. nucleus

  3. functions

  4. location


Correct Option: C
Explanation:

The shape and structure of a cell depends on the functions that it performs. 

When a cell is placed in a hypertonic solution, the contents of the cell shrink away from the cell wall. This process is known as

  1. membrane biogenesis

  2. plasmolysis

  3. turgidity

  4. transpiration


Correct Option: B
Explanation:

(plasma - protoplasm, lysis - breakdown)

Which of the following is a single membrane-bound cell organelle?

  1. Nucleus

  2. Lysosome

  3. Mitochondrion

  4. Chloroplast


Correct Option: B
Explanation:

Lysosome is a single membrane-bound cell organelle.

Which of the following organisms are unicellular?

  1. Bacteria

  2. Fungi

  3. Brown algae

  4. Sponges


Correct Option: A
Explanation:

Bacteria belong to the kingdom Monera.

Which of the following statements is/are true?

i. Robert Hooke first observed dead cells, whereas Leeuwenhoek first reported free living cells. ii. Cell theory was proposed by Virchow. iii. Purkinje coined the term 'protoplasm'.

  1. i, ii and iii

  2. i and iii

  3. iii only

  4. i only

  5. ii only


Correct Option: B
Explanation:

Robert Hooke first observed dead cells, whereas Leeuwenhoek first reported free living cells. Purkinje coined the term 'protoplasm'.

Movement of solvent across the plasma membrane from region of lower concentration of solute to the region of higher concentration of solute is known as

  1. diffusion

  2. plasmolysis

  3. osmosis

  4. active transport


Correct Option: C
Explanation:

This is the correct answer. Movement of solvent across the plasma membrane from region of lower concentration of solute to the region of higher concentration of solute is known as osmosis.

Besides nucleus, DNA is also present in

  1. golgi apparatus

  2. ribosome

  3. mitochondria

  4. vacuole


Correct Option: C
Explanation:

DNA (Deoxyribonucleic acid) is present in the nucleus of the cell. Along with nucleus, DNA is also present in mitochondria and chloroplast, but not in golgi apparatus, ribosome and vacuole. 

Organisms having well-defined nucleus with a nuclear membrane are known as

  1. prokaryotes

  2. unicellular

  3. eukaryotes

  4. multicellular


Correct Option: C
Explanation:

A eukaryote is any organism whose cells contain a nucleus and other organelles enclosed within membranes.

Which of the following statements is not true?

  1. The size of prokaryotic cell is smaller than eukaryotic cell.

  2. Prokaryotic cell has a single chromosome.

  3. Cell membrane of a eukaryotic cell bears respiratory enzymes.

  4. Nucleus is bound by nuclear membrane in eukaryotic cell.


Correct Option: C
Explanation:

Correct Answer: Cell membrane of a eukaryotic cell bears respiratory enzymes.

Which of the following statements about cells is not true?

  1. Animal cell has centrally placed nucleus.

  2. Animal cell is prokaryotic in nature.

  3. Cellulose provides structural strength to plants.

  4. Both animal cell and plant cell contain a nucleus with chromosome.


Correct Option: B
Explanation:

This statement is false. An animal cell is a form of eukaryotic cell that makes up many tissues in animals.

Rod-shaped structures in nucleus, visible at the time of cell division, are known as

  1. DNA

  2. genes

  3. chromatins

  4. chromosomes


Correct Option: D
Explanation:

The rod-shaped structures in nucleus, which are visible at the time of cell division, are known as chromosomes.

A plant cell wall is composed of an important substance known as

  1. cellulose

  2. lipid

  3. protein

  4. chitin


Correct Option: A
Explanation:

A plant cell wall is composed of an important substance known as cellulose.

The largest structure in the nucleus of eukaryotic cells that primarily serves as the site of ribosome synthesis and assembly is

  1. nucleoid

  2. nucleolus

  3. vesicle

  4. cisterna


Correct Option: B
Explanation:

Nucleolus is a non-membrane-bound structure that is composed of proteins and nucleic acids. It is the largest structure in the nucleus of eukaryotic cells, where it primarily serves as the site of ribosome synthesis and assembly.

RER looks rough under a microscope because of the presence of

  1. fat molecules

  2. carbohydrates

  3. lipids

  4. ribosomes


Correct Option: D
Explanation:

RER looks rough under a microscope because of the presence of ribosomes.

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