In non-competitive inhibition:

1. the substrate and inhibitor cannot bind to the enzyme at the same time

2. the inhibitor binds only to the substrate-enzyme complex

3. the inhibitor can bind to the enzyme at the same time as the enzyme's substrate

4. the binding of the inhibitor to the enzyme reduces its activity but does not affect the binding of substrate

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Which of the following is not consistent with the base pairings in a double stranded DNA molecule?

1. The number of C equals the number of G

2. The number of A equals the number of T

3. The amount of purine is equal to the amount of pyrimidines

4. The ratio of (G+C) to (A+T) is same for each species

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Which of the following elements is present in higher proportion [% weight of the total] in Earth's crust with respect to the average composition of a human body?

1. Carbon

2. Nitrogen

3. Sulfur

4. Magnesium

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Identify the amino acid with hydroxymethyl as its R group:

1. Glycine

2. Alanine

3. Serine

4. Phenylalanine

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All the following are nucleosides except:

1. Adenosine

2. Cytosine

3. Guanosine

4. Uridine

 

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Identify the incorrect statement regarding the structure of proteins:

1. They are heteropolymers containing strings of amino acids.

2. The first amino acid in the primary structure is the N-terminus amino acid

3. Only left helices are observed in proteins

4. Tertiary structure is absolutely essential for many biologic functions of the proteins

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At each step of its ascent, the DNA strand turns:

1. 3.4°

2. 34°

4. 3.6°

4. 36°

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The substrate has to go through a much higher energy state or transition state in case of:

1. Exothermic reactions only

2. Endothermic reactions only

3. Both exothermic and endothermic reactions

4. Neither exothermic nor endothermic reactions

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Name the enzymes that catalyze removal of groups from substrates by mechanism other than hydrolysis leaving double bonds:

1. Transferases

2. Lyases

3. Isomerases

4. Ligases

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When the co-factor is removed from the enzyme, the catalytic activity:

1. is lost.

2. is reduced.

3. is increased.

4. is unaffected.

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