GATE BT Practice Test

Question 1

How many molecules of NADH are produced per molecule of glucose during glycolysis?

Accepted Answer

2

Answer

0

Answer

1

Answer

4

Question 2

In glycolysis, there is a net gain of _____ ATP.

Accepted Answer

2

Answer

3

Answer

5

Answer

4

Question 3

In glycolysis, ATP molecules are produced by

Accepted Answer

Substrate-level phosphorylation

Answer

Photosynthesis

Answer

Cellular respiration

Answer

Photophosphorylation

Question 4

Which step of the cellular respiration pathway can take place in the absence of oxygen?

Accepted Answer

Glycolysis

Answer

Krebs cycle

Answer

Fermentation

Answer

Electron transport chain

Question 5

In the study of plant biology, a key structural component of plant cell walls is cellulose. Specic bonds within cellulose allow the cellulose bers to provide rigidity and support to plant cells. Which of the following best describes the bonds formed between monomer units during the formation of cellulose?

Accepted Answer

C-C covalent bonds

Answer

Hydrogen bonds

Answer

Peptide bond

Answer

Disulphide bridge

Question 6

The denaturation of three different proteins (P, Q and R) at different temperatures were investigated. The more denatured a protein is, the less stable the molecule becomes. The following graph shows the results of this investigation. Which of the following would be the most valid conclusion that the scientists can draw
from these results?

Accepted Answer

Protein R would be more stable and had a lower rate of denaturation above 70°C compared to protein Q, while protein P was the least heat tolerant of all the proteins

Answer

Protein R would be less stable and had a lower rate of denaturation above 70°C compared to protein Q, while protein P was fully denatured by 80°C

Answer

Protein Q would be more stable and had a lower rate of denaturation below 70°C compared to protein R, while protein P was fully denatured by 80°C

Answer

Protein Q would be less stable and had a higher rate of denaturation below 70°C compared to protein R, while protein P was the least heat tolerant of all the proteins

Question 7

Amino acids are used to make proteins. Table 1 shows the R groups of six different amino acids.

Accepted Answer

Serine, alanine, aspartic acid

Answer

Glutamic acid, alanine, asparagine

Answer

Aspartic acid, glycine, serine

Answer

Serine, asparagine, alanine,

Question 8

According to Pasteur statements which one of the following is true

Accepted Answer

Both a and b

Answer

Living organisms discriminate between stereoisomers

Answer

Fermentation is an aerobic process

Answer

Living organisms doesn’t discriminate between stereoisomers

Question 9

A mutation that produces a termination codon is

Accepted Answer

Non-sense mutation

Answer

Mis-sense mutation

Answer

Neutral mutation

Answer

Reverse mutation

Question 10

A dog is following the scent of a jackrabbit. Which of the following accurately describes how the dog's brain integrates information for smell?

Accepted Answer

Chemoreceptor cells in the nasal cavity sends impulses to the appropriate area of the brain.

Answer

Chemoreceptors in the brain send impulses for smell in the nasal cavity.

Answer

Chemoreceptors on epithelial cells of the tongue send hormones to the appropriate area of the brain.

Answer

Receptors originating in the nose send action potentials to the motor regions of the brain.

Question 11

Anaphylaxis was first observed by

Accepted Answer

Parter & Richet

Answer

Coombs

Answer

Gell

Answer

None of these

Question 12

Disease that affects many people in different countries is termed as

Accepted Answer

Pandemic

Answer

Sporadic

Answer

Epidemic

Answer

Endemic

Question 13

What is the function of ligase in DNA replication?

Accepted Answer

Joins Okazaki fragments

Answer

Unwinds the DNA

Answer

Adds nucleotides to the growing strand

Answer

Synthesizes RNA primers

Question 14

Which strand is synthesized discontinuously during DNA replication?

Accepted Answer

Lagging strand

Answer

Leading strand

Answer

Both strands simultaneously

Answer

Both strands continuously

Question 15

What is the role of primase in DNA replication?

Accepted Answer

Synthesizes the RNA primer

Answer

Unwinds the DNA

Answer

Adds nucleotides to the new strand

Answer

Removes RNA primers

Question 16

What is the name of the short segments of DNA synthesized on the lagging strand?

Accepted Answer

Okazaki fragments

Answer

Leading fragments

Answer

Replication bubbles

Answer

Primer fragments

Question 17

What is the function of topoisomerase during DNA replication?

Accepted Answer

Relieves the strain caused by unwinding DNA

Answer

Adds nucleotides to the growing strand

Answer

Synthesizes RNA primers

Answer

Joins Okazaki fragments

Question 18

What is the function of DNA polymerase during replication?

Accepted Answer

Adds nucleotides to the growing DNA strand

Answer

Unwinds the DNA

Answer

Synthesizes new RNA strands

Answer

Joins Okazaki fragments

Question 19

In which direction does DNA replication occur?

Accepted Answer

5' to 3'

Answer

3' to 5'

Answer

Both directions simultaneously

Answer

3' to 3'

Question 20

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Answer

G1 phase

Answer

G2 phase

Answer

M phase

Question 21

Which enzyme is responsible for unwinding the DNA double helix?

Accepted Answer

Helicase

Answer

DNA polymerase

Answer

Ligase

Answer

Topoisomerase

Question 22

What is the purpose of the RNA primer in DNA replication?

Accepted Answer

To provide a 3' OH group for DNA polymerase

Answer

To bind to the leading strand

Answer

To unwind the DNA helix

Answer

To remove nucleotides from the lagging strand