Question

Question 1: In DNA, which of the following functional groups plays a key role in polymerization (covalent linkage of the monomer nucleotides)?

A. phosphate

B. methyl

C. sulfhydryl

D. hydrogen

E. nitrogen

Question 2. The named components of a nucleotide of RNA are

A. ribose, phosphate, A,U,G or C base

B. deoxyribose, phosphate, A, T, G or C base

C. deoxyribose, phosphate, A, U, G, or C base

D. ribose, phosphate, A, T, G or C base

Question 3. In DNA, which of the following components of nucleotides plays a key role in hydrogen bonding to hold complementary strands together ?

A. phosphate

B. 5' end

C. ribose sugar

D. deoxyribose sugar

E. nitrogenous base

Question 4. If a protein contains several subunits (different polypeptides) in order to be completely functional, this functional, multi-subunit protein can be described as having ________________________.

A. a single N terminus and C terminus, still.

B. quaternary structure.

C. been synthesized via hydrolysis reactions.

D.been glycosylated.

Question 5. Which of the following is/are examples of a monosaccharide? (Check any/all that apply)

A. glycogen

B. sucrose

C. galactose

D. glucose

E. fructose

F. RNA, mRNA, tRNA, rRNA, and DNA

G. amino acids

H. polypeptides

I. chitin

Answer 1

Answer 1)

Phosphate group.

Two nucleotides in DNA are joined by phosphodiester bond. These nucleotides sununits when joined together by this phosphodiester bond in repeated manner and leads to formation of DNA. The DNA have thymidine where as RN ahave Uridine.

Answer 2)

Right answer is A.

because the RNA is made up of nucleotides. The nucleotides consists of:

* Ribosomes sugar

* Phosphate group

* Nitrogenous base: A, U, G and C.

Answer 3)

Right answer is E ( nitrogenous base).

because the therebisbfound hydrogen bond between nitrogenous base which helps in joiningnof two strand of DNA . For example, two hydrogen bonds are found between A and T. But three hydrogen bonds are found between G and C.

Answer 4)

Quaternary structure is the right option.

When more than one sub unit of polyoeptide chains lead to formation of a single unit structure, then this structure is known as quaternary structure. This structure makes the sub unit functional and have a particular fate in the body.

Answer 5)

Monosaccharides are also known as simple sugars. It means there is found only one unit

The examples of monosaccharides are:

*Glucose

* Galactose

* Fructose

C, D and E are the right options.

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