Questions
Which of the following organisms is/are not unicellular?
- Paramecium
- Diatoms
- Cyanobacteria
- Chlamydomonas
The shape and size of a cell is related to its
- appearance
- nucleus
- functions
- location
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
- membrane biogenesis
- plasmolysis
- turgidity
- transpiration
Which of the following is a single membrane-bound cell organelle?
- Nucleus
- Lysosome
- Mitochondrion
- Chloroplast
Which of the following organisms are unicellular?
- Bacteria
- Fungi
- Brown algae
- Sponges
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'.
- i, ii and iii
- i and iii
- iii only
- i only
- ii only
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
- diffusion
- plasmolysis
- osmosis
- active transport
Besides nucleus, DNA is also present in
- golgi apparatus
- ribosome
- mitochondria
- vacuole
Organisms having well-defined nucleus with a nuclear membrane are known as
- prokaryotes
- unicellular
- eukaryotes
- multicellular
Which of the following statements is not true?
- The size of prokaryotic cell is smaller than eukaryotic cell.
- Prokaryotic cell has a single chromosome.
- Cell membrane of a eukaryotic cell bears respiratory enzymes.
- Nucleus is bound by nuclear membrane in eukaryotic cell.
Which of the following statements about cells is not true?
- Animal cell has centrally placed nucleus.
- Animal cell is prokaryotic in nature.
- Cellulose provides structural strength to plants.
- Both animal cell and plant cell contain a nucleus with chromosome.
Rod-shaped structures in nucleus, visible at the time of cell division, are known as
- DNA
- genes
- chromatins
- chromosomes
A plant cell wall is composed of an important substance known as
- cellulose
- lipid
- protein
- chitin
The largest structure in the nucleus of eukaryotic cells that primarily serves as the site of ribosome synthesis and assembly is
- nucleoid
- nucleolus
- vesicle
- cisterna
RER looks rough under a microscope because of the presence of
- fat molecules
- carbohydrates
- lipids
- ribosomes