Question

The following compounds are usually found as a structural component of DNA and RNA.

a. ribose          b. deoxyribose            c. phosphate    d. guanine       e. cytosine

f. uracil            g. phosphodiester

1. A nucleotide is made of _________.

A.        a+b+c

B.        b+c+d

C.        c+d+e

D.        e+f+g

E.         none of the above

2. A nucleoside is made of _________.

A.   b+c

B.        b+d

C.        c+d

D.        b+g

E.         a+g

3. Which one(s) are found only in RNA?

A.        a and c

B.        a and d

C.        a and e

D.        a and f

E.         a and g

Answer 1

1. A nucleotide is made of _________.

Answer- B.        b+c+d

Reason- Nucleotide is composed of Sugar (it can be ribose or deoxyribose), a nitrogenous base ( A, T, C, and G or U), and a phosphate group.

In option A, Ribose sugar and deoxyribose sugar and the phosphate group is present, but this combination lacks a nitrogenous base.

Similarly, option C lacks a ribose sugar. Option D lacks a phosphate group and ribose sugar.

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