Chromatin

Q.

What is known as the condensation of chromosomes?

Q.

What are the functions of heterochromatin and euchromatin?

Q.

In a non-dividing cell, DNA is present as a mass of thread-like structures known as _______ .

1. ribosomes
2. chromatin
3. cytoplasm
4. chromosome

Q. Define Chromatin Fibres.

Q.

When an onion peel cell is observed under a compound microscope, the part that can be seen in

1. Nucleolus

2. Ribosomes

3. Nucleus

4. Endoplasmic reticulum

Q. Bacterial cell wall and plant cell wall are-

1. Similar in function and composition
2. Different in function and composition
3. Similar in function but different in compostion
4. Similar in composition but different in function

Q. How many chromatids are required to form a duplicated chromosome?

1. 2
2. 4
3. 1
4. More than 4

Q.

The cell component visible only during cell division is

1. mitochondria

2. chloroplast

3. chromosome

4. chromatin

Q.

Do animal cells have DNA?

Q.

When do chromosomes become visible in the nucleus of a cell?

Q. How are following related to each other :
1-Chromatin network and Chromosome
2-Chloroplast and Chlorophyll
3- Genes and DNA

Q. What are the main parts of the nucleus? Explain the function of each in brief.

Q. Write a short note on cell wall.

Q.

Question 57
Differentiate between rough and smooth endoplasmic reticulum. How is the endoplasmic reticulum important for membrane biogenesis?

Q.

The DNA in a cell, which is in its non-dividing state, is usually present as a part of the thread-like ___ material.

Q.

Chromosomes become visible under microscope when:

1. The cell completes division.

2. The cell is about to die.

3. Chromosomes are never observed under microscope

4. The cell is dividing.

Q. The endosymbiosis theory provides an explanation for the origin of

1. prokaryotes from the eukaryotes
2. chloroplast
3. mitochondria
4. both a and b

Q.

What are the long strands of genetic material in the nucleus called?

1. Cytoplasm

2. Membrane

3. Nucleic acid

4. Chromatin

Q. Which cell organelle is the key to the life of the cell?

Q. Which of the following are functions of plasma membrane?

1. Helps in energy production
2. Performs selective permeability
3. Acts as mechanical barrier
4. Provides shape

Q.

What is the role of heterochromatin?

Q. Which part of the nucleus allows small molecules to pass through the nucleus?

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

Q.

The transmission of hereditary information is not done by:

1. Genetic material

2. Chromosomes

3. DNA

4. Cytoplasm

Q. Within the nucleus, DNA is organized along with proteins into material called

1. nuclear lamina
2. chromatin
3. chromosome
4. chromatid

Q. Name the part of the cell in which:
(iii) Cellulose forms the main component.

Q. The thread like structure of DNA is known as___________.

1. Chromatin
2. Chromosome
3. Gene
4. Templates

Q.

Which of the following is not a part of nucleus?

1. Chromosomes

2. Nuclear pore

3. Lysosome

4. Nucleolus

Q. If diploid chromosome number in a flowering plant is 12, then which one of the following will have only 6 chromosomes?

1. Endosperm
2. Leaf cells
3. Cotyledons
4. Synergids

Q.

Expand the biological abbreviation: DNA

Q. What is the structural difference between Euchromatin and heterochromatin??