Structure of Chromosomes

Q. Nucleoproteins are

1. proteins found in the nucleus
2. pigment molecules
3. proteins linked to a nucleic acid
4. novel proteins

Q. Small disc-shaped structures at the surface of the centromeres that appear during metaphase are:

1. Kinetochores
2. Metaphase plate
3. Spindle fibres
4. Chromatid

Q. Nucleoproteins are

1. proteins found in the nucleus
2. pigment molecules
3. proteins linked to a nucleic acid
4. novel proteins

Q.

Name the following:
A cell that has two sets of chromosomes.

Q. Balbiani rings are sites of:

1. RNA and protein synthesis
2. Lipid synthesis
3. Nucleotide synthesis
4. Polysaccharide synthesis

Q. A single human cell has approximately _____ long thread of DNA distributed among its _____ chromosomes.

1. 2 cm, 46
2. 2 metre, 46
3. 2 cm, 23
4. 2 metre, 23

Q. Choose the pair that does not match.

1. Lampbrush chromosomes - Diplotene bivalents
2. Allosomes - Sex chromosomes
3. Submetacentric chromosomes - L shaped chromosomes
4. Polytene chromosomes - Oocytes of amphibians

Q. Eukaryotic chromosomes are thousands times longer than a typical cell. How do chromosomes fit inside a eukaryotic nucleus?

1. The genetic material remains distributed in the nucleus, mitochondria, and chloroplast
2. The chromosome is present in pieces, thus it fits the size of the nucleus
3. The DNA remains coiled around proteins to form nucleosomes which further coils to compact itself
4. The genetic material remains bound to the nuclear envelope, forming invaginations

Q. Haploid chromosome is represented as _______.

1. 2n
2. 3n
3. n
4. n/2

Q. Humans have ___ pairs of chromosomes

Q.

Chromosomes are pinched off at the ends. These are called _____.

1. Satellite chromosomes

2. Chromatin

3. Histones

4. Sister chromatids

Q. Which of the following is not true about polytene chromosome?

1. They are chromosomes which have developed from standard chromosomes
2. They are formed due to repeated rounds of DNA replication without any cell division and are held together at a single point,
3. Polytene chromosomes are, involved in intense secretory functions.
4. They are cells that contain multiple sets of chromosomes and not held together at a single point.

Q. Which of the following occurs more than one and less than five in a chromosome?

1. Chromatid
2. Chromomere
3. Centromere
4. Telomere