11 Biology- 9. Biomolecules : Online Test

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Which one is the most abundant protein in the animal world? *

2 points

Trypsin

Haemoglobin

Collagen

Insulin

A competitive inhibitor of succinate dehydrogenase, is *

2 points

malate

alpha-Ketoglutarate

malonate

oxaloacetate

Which on of the following pairs of nitrogenous bases of nucleic acids is wrongly matched with the category mentioned against it? *

2 points

Thymine, Uracil-- Pyrimidines

Uracil, Cytosine-- Pyrimidines

Guanine, Adenine-- Purines

Adenine, Thymine-- purines

In a DNA molecule , *

2 points

the total amount of purine nucleotides and pyrimidine nucleotides is not always equal

there are two strands, which run parallel in the 5'-->3' direction

the proportion of adenine in relation to thymine varies with the organism

there are two strands, which run antiparallel - one in 5'-->3' direction and the other in 3'-->5'

One turn of the helix in a B-DNA is approximately *

2 points

20 nm

0.34 nm

3.4 nm

2 nm

The catalytic efficiency of two enzymes can be compared by the *

2 points

formation of the product

opitimum pH values

Km values

molecular size of enzymes

Which of the following enzymes is necessarily associated with copper as an activator ? *

2 points

Tyrosinase

Lactic dehydrogenase

Phosphatase

Carbonic anhydrase

Which form of RNA has a structure resembling a clover leaf? *

2 points

hnRNA

tRNA

mRNA

rRNA

If the total amount of adenine and thymine in a double-stranded DNA is 60%, then the amount of guanine in this DNA will be *

2 points

15%

20%

30%

40%

Maltose gives rise to two molecules of *

2 points

fructose

lactose

glucose

sucrose

A nucleoside differs from a nucleotide is not having *

2 points

sugar

phosphate group

glucose

nitrogen base

The 'lock and key' model of enzyme action illustrates that a particular enzyme molecule. *

2 points

may be destroyed and resynthesised several times

interacts with a specific type of substrate molecule

reacts at identical rates under all conditions

forms as permanent enzymes-substrate complex

The substance, which is a metal ion, essential for the normal functioning of enzyme, is called *

2 points

cofactor

holoenzyme

coenzyme

prosthetic group

Lactose is composed of *

2 points

glucose and fructose

glucose and galactose

glucose and glucose

glucose, fructose and galactose

The double-helical model of DNA was proposed by Watson and Crick. Based on what data they produced this model? *

2 points

hybridisation

Transformation

X-ray diffraction

DNA sequencing

Nitrogenous bases present in DNA are *

2 points

adenine, guanine, cytosine, uracil

adenine, guanine, thymine, cytosine

adenine, thymine, uracil

guanine, uracil

An organic substance bound to an enzyme and is essential for the activity of the enzyme, is *

2 points

apoenzyme

holoenzyme

isoenzyme

coenzyme

In which of the following forms is glucose stored in liver? *

2 points

Starch

Glycogen

Sucrose

Cellulose

The bound formed between two sugars in carbohydrates is *

2 points

amide bond

phosphodiester bond

hydrogen bond

glycosidic bond

Which of the following sugars is present in nucleic acids? *

2 points

Dextrose

deoxyribose

Levulose

Glucose

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