DNA

Q.

What are the two structures found in plant cells and not in animal cells ?

Q.

What is the biological significance of DNA?

Q.

What is the name of the chemical substance which constitutes the genes ?

Q. Differentiate between the following pairs of terms:
(a) Protoplasm and cytoplasm.

Q. The hereditary material present inside the nucleus is called .

Q. The DNA present in a condensed form is known as . This further condenses to form during cell division

1. chromatin
2. gene
3. Nucleus
4. chromosomes

Q. What is the difference between hybridisation and recombinant dna tech?

Q.

dna is called acid why?

Q. Which of the following statements is/are true regarding RNA and DNA?

A. RNA is double stranded while DNA is single stranded.
B. RNA has base uracil in place of thymine in DNA.
C. RNA contains the sugar deoxyribose while DNA contains the sugar ribose.
D. DNA is hereditary material but if it is absent RNA can function as hereditary material.

Q.

What does the D in DNA stand for?

Q.

DNA has deoxyribose and a base. What is the third component?

Q. The primary constriction at the centre of the chromosome is called ______.

1. centrosome
2. centromere
3. cytosine
4. centriole

Q.

Can we survive without DNA?

Q.

DNA replication occurs in:

1. S phase

2. G phase

3. G2 phase

4. M phase

Q. Microtubules are absent in:

1. Centriole
2. Spindle fibres
3. Mitochondria
4. Flagella

Q. The term ‘gene’ refers to:

1. Sequence of amino acids in proteins
2. A linkage group
3. A part of RNA
4. A portion of DNA

Q.

Differentiate between 1) Organs and Organelles 2) Plant cell and animal cells

Q.

A single strand of DNA is composed of repeating

1. Nucleoside

2. Pentose

3. Nucleotide

4. Nucleosome