Nucleus

Q.

Explain the structure of nucleus with the help of labelled diagram.

Q.

____ are called the power house of the cell.

1. Mitochondria

2. Endoplasmic Reticulum

3. Golgi complex

4. Lysosomes

Q.

What are nuclear pores? State their function.

Q.

Name the organelles which show the analogy written as under:

(a) Transporting channels of the cell

(b) Powerhouse of the cell

(c) Packaging and dispatching unit of the cell

(d) Digestive bag of the cell

(e) Storages sacs of the cell

(f) Kitchen of the cell

(g) Control room of the cell

Q.

Is the nuclear envelope a derivative of the endoplasmic reticulum?

Q. The nucleus has

1. one membrane with pores
2. two membranes without pores
3. two membranes without pores through which substances cannot pass through
4. two membranes with pores through which substances can pass through

Q.

What happens when an animal cell is placed in a very dilute external medium ? Why ?

Q. Agarose extracted from seaweeds finds use in

1. Tissue culture
2. Gel electrophoresis
3. PCR
4. Spectrophotometry

Q. To isolate protoplast, one needs:

1. chitinase.
2. both pectinase and cellulase
3. pectinase
4. cellulase

Q. In Plant biotechnology, PEG is used in

1. Protoplast isolation
2. protoplast fusion
3. hardening
4. cell culture preparation

Q. Select the correct statement.

1. All eukaryotic cells at every stage of development contain a nucleus
2. The nucleus contains energy extracting machinery
3. None of the above
4. The outer nuclear membrane may contain ribosomes

Q.

What is the importance of semipermeable membrane in osmosis?

Q.

The liquid material in the nucleus is:

1. Nucleoplasm

2. Chromosomes

3. Bacteria

4. Nucleolus

Q. Nucleoproteins are synthesised in:

1. Nucleoplasm
2. Nuclear envelope
3. Nucleolus
4. Cytoplasm

Q. Choose the correct statement.

1. Transcription and translation occur in same compartment for prokaryotes
2. Monocistonic RNA-more than one structural genes under single promoter
3. Introns and exons both code for protein synthesis
4. In prokaryotes, splicing and tailing occurs before translation

Q.

Does the nucleus contain DNA?

Q.

Where Have The Program And Data To Be Located Before The ALU And Control Unit Of A Computer Can Operate On It?

1. Magnetic Tapes.

2. Microprocessor

3. Internal Memory

4. Secondary Memory

Q.

How many base pairs of DNA helix are there in a typical nucleosome?

Q.

The chromatids of a chromosome are attached at a point called

1. Centriole.

2. Centromere.

3. Chromomere.

4. Centrosome.

Q.

Where are nucleoproteins synthesized?

Q. Osmosis is a special kind of diffusion, in which water diffuses across the cell membrane. The rate and direction of osmosis depends upon both

Q. a) Define a cistron.

b) Giving examples differentiate between monocistronic and polycistronic transcription units.

Q.

Define peri-nuclear space.

Q. Arrange the structures from inside to the outside as observed in a bacterial cell.

1. Glycocalyx 2. Cell membrane 3. Cell wall 4. Cytoplasm

1. Glycocalyx, cell wall, cell membrane, cytoplasm
2. Cytoplasm, cell membrane, cell wall, glycocalyx
3. Cell wall, glycocalyx, cell membrane, cytoplasm
4. Cytoplasm, cell membrane, glycocalyx, cell wall

Q. Which of the following terms can alternatively be used to describe karyolymph?

1. Nucleoplasm
2. Cytoplasm
3. Protoplasm
4. All of these

Q.

Proteins are formed at

1. ribosomes

2. chloroplast

3. mitochondria

4. nuclear membrane

Q.

Do lymphocytes undergo mitosis?

Q. Centrioles differ from cilia or flagella in
(a) the number of microtubules in each peripheral group
(b) the number of radial spokes
(c) the arrangement of microtubules
(d) containing proteinaceous central hub
(e) being surrounded by double membrane
Choose the correct set of options.

1. a, c and d
2. a, b, c and d
3. a, b and c
4. b, c, d and e

Q. Which among the following would you find in a eukaryotic nucleus?

1. Nuclear membrane
2. Chromatin
3. Nucleolus
4. All of the above

Q. Fill in the blanks:​ ​
1) Chromatin fibre is made up of DNA and ​