DNA and It's Structure

Q. A nucleotide consists of a sugar molecule, nitrogenous base and a phosphate group.

1. True
2. False

Q.

Purines found both in DNA and RNA are

1. Cytosine and thymine

2. Adenine and thymine

3. Adenine and guanine

4. Guanine and cytosine

Q. In DNA, adenine always pairs with .

1. cytosine
2. thymine
3. uracil

Q. DNA was first identified by:

1. Francis Crick
2. James Watson
3. Friedrich Miescher
4. Gregor Mendel

Q.

Who proposed the Structure of DNA?

1. Darwin and Wallace

2. Schleiden and Schwann

3. Watson and Crick

4. Mendel and morgan

Q. Identify the main objective of the Human Genome Project from the following?

1. Identify and sequence all the genes present in human DNA.
2. Remove disease-causing genes from human DNA.
3. Introduce new genes into human genome.
4. Design human clones.

Q.

Who related nucleus to inheritance of characters?

Q. Arrange these discoveries in chronological order from oldest to latest.

i. Isolation of nucleic acid
ii. Heredity factors
iii. Model of DNA molecule
iv. Human Genome Project

1. i$\to$ii$\to$iii$\to$iv
2. iv$\to$iii$\to$i$\to$ii
3. ii$\to$i$\to$iii$\to$iv
4. ii$\to$i$\to$iv$\to$iii

Q.

Why does any nucleotide of a gene changes it's position that causes a minor change?

Q.

What is incorrect about DNA?

1. Sugar is pentose

2. Phosphodiester bonds between nucleotides

3. Glycosidic bond in nucleoside

4. Pyrimidine is uracil

Q.

Which of the following correctly defines the branch of genomics?

1. The study of genomes

2. The study of genes

3. The study of chromosomes

4. The study of DNA

Q. DNA was first identified by:

1. Francis Crick
2. Gregor Mendel
3. James Watson
4. Friedrich Miescher

Q.

Purines are the same in both DNA and RNA.

1. True

2. False

Q.

The nitrogenous bases of DNA are:

1. UTGC

2. AUGC

3. ATUC

4. ATGC

Q. Mendel knew about the discovery of the nuclein in cell at the time when he conducted his famous experiments on the pea plants.

1. True
2. False

Q. What does $A,B$ and $C$ represent in the given figure of a chromosome?

1. A - Centriole, B - Satellite, C - Primary constriction
2. A - Centriole, B - Satellite, C - Secondary constriction
3. A - Centromere, B - Satellite, C - Secondary constriction
4. A - Centromere, B - Satellite, C - Primary constriction

Q. what is a genome?

Q. Tick the correct option to complete the sentence.
A. Two strands of DNA are held together by ________ bonds. (hydrogen/nitrogen)
B. ___________ is the pentose sugar present in DNA. (Ribose/Deoxyribose)

Q. Which of the following is a characteristic of the DNA molecule?

1. Made up of nucleotides
2. Nitrogenous bases are AUGC
3. Absent in viruses
4. Single stranded molecule

Q. Identify the incorrect statement/s from the following with respect to DNA.

1. Adenine and cytosine are purines.
2. Nitrogenous bases are joined by hydrogen bonds.
3. DNA is made up of sugar and phosphate molecules only.
4. Adenine always pairs with guanine.