Biomolecules Test

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Biomolecules Test - 85

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Weekly Quiz Competition

Question 1
1 / -0

Tunicin is also called?

A
Chitin

B
Cuticle

C
Animal cellulose

D
Scleroprotein

Solution

Tunicin is a chemical that forms the tunic or exoskeleton in Tunicates or organisms belonging to the subphylum Urochordata. It is a polysaccharide that is chemically similar to cellulose in plants and hence, also known as animal cellulose.
So, the correct answer is 'Animal cellulose'.
Question 2
1 / -0

Nucleic acids were discovered by

A
Watson and Crick

B
Khorana

C
Wilkins

D
Miescher

Solution

Miescher discovered nucleic acids from pus cells in discarded surgical bands. He observed that these were acidic in nature. The two types of nucleic acid were DNA and RNA. These are considered as the hereditary unit of the cell. These carry characters from one generation to the other.
So, the correct answer is option D.
Question 3
1 / -0

........... was coined by Berzelius.

A
DNA

B
Hydrogen

C
Protein

D
Hormone

Solution

Swedish chemist Berzelius had devised the chemical symbols, the first accurate list of atomic weights and experiments confirming Daltons theory that all elements must be made of distinct atoms. He also coined the words "catalyst", "protein", "isomer".
Question 4
1 / -0

Which of the following are the characteristics of P-proteins?

A
Sieve cell

B
Sieve tubes of monocots

C
Sieve tubes of dicots

D
Both B and C

Solution

In the dicots, the sieve tubes are comprised of the protein called as phloem or P protein. This protein is rarely found in the monocot plants. In immature cells, P protein appears to function in sealing off damaged sieve elements by plugging the sieve plate pore. When a sieve tube is cut, the release of pressure causes the content of sieve element to surge towards the cut end from which the plant could lose sugar rich phloem sap if some sealing mechanism is not there.
Thus, the correct answer is option C.
Question 5
1 / -0

Select the correct statement for a protein.

A
An average weight, stable man degrades and synthesizes 400g of protein per day.

B
Approximate half life of a average body protein is 80 days.

C
In the body proteins are constantly broken down and resynthesized.

D
All of the above.

Solution

Proteins are the most dynamic biomolecules performing a variety of structural and functional roles. The proteins have a high turn over and constantly old or worn out molecules are broken down and newer molecules are synthesized. Sprinson and Rittenberg (1949) estimated that in man, the average half life of the proteins of whole body is of the order of 80 days. Total body protein synthesis is 400 gram per day, establishing an equilibrium between bodily proteins and circulating plasma proteins.
Question 6
1 / -0

Germinated barley seeds, called malt, are the source of which enzyme?

A
zymase

B
diastase

C
maltase

D
invertase

Solution
Question 7
1 / -0

The active site of an enzyme is situated in its amino acids _________ .

A
Amino groups

B
Carboxyl groups

C
R-groups

D
All the above

Question 8

1 / -0

Match the compounds and their chemical units.

Compound	Units
A. Amylopectin	p. Unbranched polymer of glucose
B. Lignin	q. Branched polymer of glucose
C. Chitin	r. Complex polymer of aromatic alcohols
D. Proteins	s. Polymer of acetyl glucosamine
	t. Polymer of amino acids

A - p, B - r, C - s, D - t

A - q, B - r, C - s, D - t

A - q, B - p, C - s, D - t

A - p, B - r, C - p, D - t

Solution

Starch a storage polysaccharides of plants is made up of amylose (straight chain of glucose) and amylopectin (branched chain of glucose).

Lignin is a polymer of coniferyl alcohol and other aromatic alcohols.

Chitin is a polymer which forms cell wall in fungi and arthropods. It is made up of acetyl glucosamine units.

Proteins are polymers of amino acids. In proteins amino acids are joined together by peptide bonds.

So, the correct answer is 'A - q, B - r, C - s, D - t'

Question 9
1 / -0

One picogram (pg) is equal to how many base pairs (bp)?

A
$$ 1 \times 10^9$$

B
$$0.965 \times 10^9$$

C
$$0.965 \times 10^{10}$$

D
$$0.963 \times 10^8$$

Solution

The weight of nucleotide bases can be calculated from the chemical formula and relative weights can be used to correlate the weight with the number of bases expected in a given sample of DNA. Using this technique it has been estimated that the mean weight of one nucleotide pair would be 1.023 x 10$$^9$$ pg, and 1 pg of DNA would represent 978000000 base pairs. Some workers have reported a lower value (965000000). The correct formula for converting the picograms of DNA into number of nucleotide pairs will be (978000000) x (DNA content in picograms).
Thus, the correct answer is option B.
Question 10
1 / -0

Which of the following statements is incorrect about amino acids?

A
All known $$\alpha$$-amino acids possess an asymmetric carbon atom.

B
Certain antibiotics contain some amino acids in D-isomer form.

C
If an amino acid has more than one asymmetric carbon atom, all the isomers shall be optically active.

D
None of the above.

Solution

Usually living systems comprise of D amino acids and L sugars. It is not that only some antibiotics have D-amino acids. The $$\alpha$$-amino acids have an $$\alpha$$-carbon atom to which four different groups are attached like R or substituent or variable group, amino group, carboxylic group and hydrogen. So, all the $$\alpha$$-amino acids have an asymmetric carbon and they are optically active. But glycine is different, in glycine the R is hydrogen. Hence, glycine is not optically active and lacks an asymmetric carbon atom. As far as optical isomerism is concerned, we can safely say that if an amino acid has more than one asymmetric carbon atom it will be optically active.

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Biomolecules Test - 85

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Biomolecules Test - 85

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SHARING IS CARING

Question 1

Chitin

Cuticle

Animal cellulose

Scleroprotein

Solution

Question 2

Watson and Crick

Khorana

Wilkins

Miescher

Solution

Question 3

DNA

Hydrogen

Protein

Hormone

Solution

Question 4

Sieve cell

Sieve tubes of monocots

Sieve tubes of dicots

Both B and C

Solution

Question 5

An average weight, stable man degrades and synthesizes 400g of protein per day.

Approximate half life of a average body protein is 80 days.

In the body proteins are constantly broken down and resynthesized.

All of the above.

Solution

Question 6

zymase

diastase

maltase

invertase

Solution

Question 7

Amino groups

Carboxyl groups

R-groups

All the above

Question 8

A - p, B - r, C - s, D - t

A - q, B - r, C - s, D - t

A - q, B - p, C - s, D - t

A - p, B - r, C - p, D - t

Solution

Question 9

$$ 1 \times 10^9$$

$$0.965 \times 10^9$$

$$0.965 \times 10^{10}$$

$$0.963 \times 10^8$$

Solution

Question 10

All known $$\alpha$$-amino acids possess an asymmetric carbon atom.

Certain antibiotics contain some amino acids in D-isomer form.

If an amino acid has more than one asymmetric carbon atom, all the isomers shall be optically active.

None of the above.

Solution

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