Chromatin

Q. Sex determination in animals such as humans and insects is done using the XX-XO and XX-XY mechanisms. In some organisms ZZ-ZW mechanism of sex determination is seen.
Based on the given statement, answer the question given below.

XX-XO type of sex determination and XX-XY type of sex determination are examples of
[1 mark]

1. male heterogamety
2. female heterogamety
3. male homogamety
4. haplo-diploid system

Q. The interphase nucleus has a loose and indistinct network of nucleoprotein fibres called chromatin, but during different stages of cell division, cells show "structured chromosomes" in place of the:

1. Nucleus
2. Nucleosome
3. Solenoid
4. Plasmosome

Q.

Explain the structure and functions of nucleus.

Q. Chromatin contains:

1. DNA only
2. DNA and histones
3. DNA, histones, non-histones
4. DNA, histones, non-histones and RNA

Q. The light stained and the diffused region of the chromatin is known as

1. Heterochromatin
2. Euchromatin
3. Chromatin
4. None of the above

Q.

Which is the control center of the cell?

Q.

Difference between euchromatin and heterochromatin

Q.

The association of histone H₁ with a nucleosome indicates

1. Transcription is occurring

2. DNA replication is occurring

3. The DNA is condensed into a Chromatin Fibre

4. The DNA double helix is exposed

Q. The terms cistron, recon and muton were proposed by

1. 
   Johannsen
2. 
   Morgan
3. 
   Lederberg
4. 
   Benzer

Q.

XX-XO type of sex determination and XX-XY type of sex determination are examples of

1. male heterogamety
2. female heterogamety
3. male homogamety
4. female homogamety

Q. Match the columns and identify the correct option:

	Column - I		Column - II
(a)	Thylakoids	(i)	Disc-shaped sacs in Golgi apparatus
(b)	Cristae	(ii)	Condensed structure of DNA
(c)	Cisternae	(iii)	Flat membranous sacs in stroma
(d)	Chromatin	(iv)	Infoldings in mitochondria

1. (a)→(iii), (b)→(iv), (c)→(ii), (d)→(i)
2. (a)→(iv), (b)→(iii), (c)→(i), (d)→(ii)
3. (a)→(iii), (b)→(iv), (c)→(i), (d)→(ii)
4. (a)→(iii), (b)→(i), (c)→(iv), (d)→(ii)

Q. How many linkage groups are found in human males?

1. 46
2. 23
3. 22
4. 24

Q. What do you mean by a linkage group?

1. A group comprising all the genes located at the same distance from the centromeres of their respective chromosomes
2. A group comprising the genes located at the terminal positions of their respective chromosomes
3. A group comprising all the genes located on a single chromosome
4. A group comprising of genes located on the sex chromosomes only

Q.

A complex of ribosomes attached to a single strand of RNA is known as

1. Okazaki fragement

2. Polypeptide

3. Polymer

4. Polysome

Q. Which is the transcriptionally inactive chromatin?

1. Heterochromatin
2. Euchromatin
3. Both B and C
4. Loosely packed chromatin

Q. The nucleus is absent in the mature

1. Sieve tube cells
2. Monocytes
3. Mammalian Erythrocytes
4. Both a & c

Q.

Does chromatin contain RNA?

Q. Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active?

Q. DNA is present in

1. chromosomes and dictyosomes
2. chloroplast and lysosomes
3. mitochondria and chloroplast
4. mitochondria and endoplasmic reticulum

Q.

The outermost covering of the cell

Q. The association of histone H1 with a nucleosome indicates:

1. DNA replication is occurring
2. The DNA is a condensed into a Chromatin Fibre
3. Transcription is occurring
4. The DNA double helix is exposed

Q. The thread-like uncoiled structures in the nucleus of a resting cell are

1. chromatophores
2. chromatids
3. chromosomes
4. chromatin

Q.

A suitable term for the various components of cells is

1. tissue

2. chromosomes

3. cell organelles

4. genes

Q.

The outermost layer of cheek cells and onion peel cells is

1. Cell membrane, cell wall

2. Cell wall, cell membrane

3. Tonoplast, cell wall

4. Cell wall, tonoplast

Q. In humans, the sex of the baby is determined_________.

1. at the time of implantation and by the maternal gamete
2. at the time of implantation and by the paternal gamete
3. at the time of fertilization and by the maternal gamete
4. at the time of fertilization and by the paternal gamete

Q. The thread-like uncoiled structures in the nucleus of a resting cell are

1. chromosomes
2. chromatophores
3. chromatids
4. chromatin

Q.

Are UTRs part of exons?

Q.

Does chromatin contain non-histone protein?

Q.

What is the difference between histones and nucleosomes?

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

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