GATE BT Practice Test

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Question 1 of 10 10% complete

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

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

In glycolysis, ATP molecules are produced by

Substrate-level phosphorylation

Photosynthesis

Cellular respiration

Photophosphorylation

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

Krebs cycle

Fermentation

Electron transport chain

Glycolysis

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?

Hydrogen bonds

C-C covalent bonds

Peptide bond

Disulphide bridge

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?

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

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

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

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

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

Serine, alanine, aspartic acid

Glutamic acid, alanine, asparagine

Aspartic acid, glycine, serine

Serine, asparagine, alanine,

According to Pasteur statements which one of the following is true

Living organisms discriminate between stereoisomers

Fermentation is an aerobic process

Living organisms doesn’t discriminate between stereoisomers

Both a and b

A mutation that produces a termination codon is

Mis-sense mutation

Neutral mutation

Non-sense mutation

Reverse mutation

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

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

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

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

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

Anaphylaxis was first observed by

Parter & Richet

Coombs

Gell

None of these

Disease that affects many people in different countries is termed as

Sporadic

Pandemic

Epidemic

Endemic

What is the function of ligase in DNA replication?

Unwinds the DNA

Adds nucleotides to the growing strand

Joins Okazaki fragments

Synthesizes RNA primers

Which strand is synthesized discontinuously during DNA replication?

Leading strand

Lagging strand

Both strands simultaneously

Both strands continuously

What is the role of primase in DNA replication?

Unwinds the DNA

Synthesizes the RNA primer

Adds nucleotides to the new strand

Removes RNA primers

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

Okazaki fragments

Leading fragments

Replication bubbles

Primer fragments

What is the function of topoisomerase during DNA replication?

Adds nucleotides to the growing strand

Relieves the strain caused by unwinding DNA

Synthesizes RNA primers

Joins Okazaki fragments

What is the function of DNA polymerase during replication?

Unwinds the DNA

Synthesizes new RNA strands

Adds nucleotides to the growing DNA strand

Joins Okazaki fragments

In which direction does DNA replication occur?

5' to 3'

3' to 5'

Both directions simultaneously

3' to 3'

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

G1 phase

G2 phase

S phase

M phase

Which enzyme is responsible for unwinding the DNA double helix?

Helicase

DNA polymerase

Ligase

Topoisomerase

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

To bind to the leading strand

To provide a 3' OH group for DNA polymerase

To unwind the DNA helix

To remove nucleotides from the lagging strand

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