Biomolecules Test

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Biomolecules Test - 58

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Weekly Quiz Competition

Question 1
1 / -0

Carbohydrates are ___________.

A
used to make a paper

B
produced as an intermediate in the synthesis of proteins

C
the polyhydroxy aldehyde or polyhydroxy ketone

D
all of these

Solution

Carbohydrates are polyhydroxy aldehydes or polyhydroxy ketone. Cellulose is a carbohydrate used to make a paper. Carbohydrates are also produced as an intermediate in the synthesis of protein.
Question 2
1 / -0

Peristent nucellus is called as _________ and is found in _________.

A
Perisperm, black pepper

B
Perisperm, groundnut

C
Endosperm, black pepper

D
Endosperm, groundnut

Solution

In some seeds, remains of nucellus persist. This residual nucellus which persists in the seed is called perisperm, e.g., black pepper, coffee, castor, cardamom, Nymphaea.
Question 3
1 / -0

The general formula of carbohydrates is:

A
$${C}_{n}{H}_{2n+1}O$$

B
$${C}_{n}{H}_{2n}O$$

C
$${C}_{n}{({H}_{2}O)}_{n}$$

D
$${C}_{n}{({H}_{2}O)}_{2n}$$

Solution

The general formula for any carbohydrate is $${(C{H}_{2}O)}_{n} = {C}_{n}{({H}_{2}O)}_{n}$$
Question 4
1 / -0

Starch is made by photosynthesis in the leaves of plants. It is found in rice, potatoes, and many vegetables sources. It can be detected with a drop of iodine. In the presence of starch, iodine:

A
vapourises

B
turns blue

C
decolourises

D
turns into a black solid

Solution

(B) Turns blue
When starch is mixed with iodine in water, an intensely blue colored starch/iodine complex is formed.
Question 5
1 / -0

Which carbon atom of deoxy Ribose sugar in DNA does NOT contain $$-\overset{|}{\underset{|}{C}}-OH$$ bond?

A
$$C_5$$

B
$$C_3$$

C
$$C_2$$

D
$$C_1$$
Question 6
1 / -0

Which of the following is not the example of carbohydrate?

A
Glucose

B
Maltose

C
Glycine

D
Fructose

Solution

Here Glucose, Maltose, and Fructose are carbohydrate. Glycine is not a carbohydrate. It is a protein.
Question 7
1 / -0

Which of the following treatment will convert starch directly into glucose?

A
Heating with dilute $${H}_{2}{SO}_{4}$$

B
Fermentation by diastase

C
Fermentation by zymase

D
Heating with dilute $$NaOH$$

Solution

Answer: $$(A)$$ Heating with diute $${H}_{2}S{O}_{4}$$
Commercially glucose is obtained by hydrolysis of starch by heating it with dilute $${H}_{2}S{O}_{4}$$ at 393 K under pressure.
$$\underset{Starch}{{\left({C}_{6}{H}_{10}{O}_{5} \right)}_{n}} + n{H}_{2}O \xrightarrow[393 K; \; 2-3 atm]{{H}^{+}} \underset{Glucose}{n{C}_{6}{H}_{12}}{O}_{6}$$
Question 8
1 / -0

Which of the following reactions is not enzyme-mediated in biological system?

A
Dissolving $$CO_2$$ in water

B
Unwinding the two strands of DNA

C
Hydrolysis of sucrose

D
Formation of peptide bond

Solution

$$\textbf{Correct option: (A)}$$

$$\textbf{Explanation for correct option:}$$

$$\bullet$$ Dissolving $${CO_2}$$ in water does not require an enzyme.

$$\bullet$$ Solubility of $${CO_2}$$ in water can be increased with decrease in temperature, a principle used in carbonated drinks.

$$\textbf{Explanation for incorrect options:}$$

$$\bullet$$ DNA helicases move along the double-stranded DNA and separate the strands by breaking hydrogen bonds at the expense of energy from ATP.

$$\bullet$$ The hydrolysis of sucrose generates an equimolar mixture of fructose and glucose, commercially sucrose is also known as invert sugar. This (hydrolysis of sucrose) reaction is mediated by the enzyme invertase/sucrase.

$$\bullet$$ Peptidyl transferase is an enzyme that catalyzes peptide bond formation.
Question 9
1 / -0

A compound which contains both ______ and ______ is called amino acid. The amino acids in polypeptide chain are joined by ______ bonds.

A
amino, carboxylic group, ester

B
amino, carboxylic group, peptide

C
nitrogen, carbon, glycosidic

D
hydroxy, carboxylic group, peptide

Solution

Amino acids are organic compounds containing amine $$(-N{H}_{2})$$ and carboxyl (-COOH) functional groups. Amino Acids Are Linked by peptide bonds formed by linking the $$\alpha$$-carboxyl group of one amino acid to the $$\alpha$$-amino group of another amino acid.
Question 10
1 / -0

The $$\alpha$$ amino acid which contains the aromatic side chain is:

A
proline

B
tyrosine

C
valine

D
serine

Solution

To different degrees, all aromatic amino acids absorb ultraviolet light. Tyrosine and tryptophan absorb more than do phenylalanine. Tyrosine is the only one of the aromatic amino acids with an ionizable side chain.

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Biomolecules Test - 58

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Biomolecules Test - 58

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SHARING IS CARING

Question 1

used to make a paper

produced as an intermediate in the synthesis of proteins

the polyhydroxy aldehyde or polyhydroxy ketone

all of these

Solution

Question 2

Perisperm, black pepper

Perisperm, groundnut

Endosperm, black pepper

Endosperm, groundnut

Solution

Question 3

$${C}_{n}{H}_{2n+1}O$$

$${C}_{n}{H}_{2n}O$$

$${C}_{n}{({H}_{2}O)}_{n}$$

$${C}_{n}{({H}_{2}O)}_{2n}$$

Solution

Question 4

vapourises

turns blue

decolourises

turns into a black solid

Solution

Question 5

$$C_5$$

$$C_3$$

$$C_2$$

$$C_1$$

Question 6

Glucose

Maltose

Glycine

Fructose

Solution

Question 7

Heating with dilute $${H}_{2}{SO}_{4}$$

Fermentation by diastase

Fermentation by zymase

Heating with dilute $$NaOH$$

Solution

Question 8

Dissolving $$CO_2$$ in water

Unwinding the two strands of DNA

Hydrolysis of sucrose

Formation of peptide bond

Solution

Question 9

amino, carboxylic group, ester

amino, carboxylic group, peptide

nitrogen, carbon, glycosidic

hydroxy, carboxylic group, peptide

Solution

Question 10

proline

tyrosine

valine

serine

Solution

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