Nucleic Acids - class-XII
nucleic acids, nucleotides, DNA, RNA structure, and genetic code
Questions
Nucleic acids are the polymers of __________
- nucleosides
- nucleotides
- bases
- sugars
Which of the following is correxect bonding in nucleotide?
- $A - T, \ G - C$
- $A - G,\ T - C$
- $G - T,\ A - C$
- $A - A,\ T - T$
A unit in nucleic acid which contains 'base-sugar phosphate' unit is called ?
- nuleotide
- nucleoside
- phosphotide
- polypeptide
Which of the following bases is not present in DNA?
- Adenine
- Thymine
- Cytosine
- Uracil
The $AT/GC$ ratio in human beings is: (where $A=$adenine,$T=$thymine,$G=$Guanine,$C=$cytosine)
- $1$
- $1.52$
- $9.3$
- $2$
RNA is ?
- single helix strand
- double helix strand
- right hand twisted double helix strand
- triple helix strand
A nucleotide consists of
- carbon sugar
- nitrogen containing base
- phosphoric acid
- All of the above
The replication of DNA can be catalyzed by:
- protein
- enzyme
- bacteria
- metal atom
Emperical formula of glucose is
- ${C _6}{H _{12}}{O _6}$
- $\;{C _3}{H _6}{O _3}\;$
- $\;{C _2}{H _4}O\;\;\;\;$
- $C{H _2}O$
Which among the following sequence defines Ribonucleotide?
- Ribose sugar $+$ Nitrogenous base
- Ribose sugar $+$ Protein
- Ribose sugar $+$ Phosphoric acid
- Ribonucleoside $+$ Phosphate group
A nucleotide is made up of:
-
a base and sugar - a base and phosphate unit
- a sugar and phosphate unit
- a sugar, a base and a phosphate unit
The sequence between nucleotide triplets and the amino acids is called
- transcription
- duplication
- genetic code
- gene
The genetic language of nucleotides translates into language of:
- carboxylic acids
- amino acids
- ketones
- aldehydes
The sugar unit present in the nucleotides of RNA is :
- D - ribulose.
- L - ribose.
- D - ribose.
- L - ribulose.
Which of the following is not present in nucleotide?
- guanine
- cytosine
- adenine
- tyroxine
The relationship between the nucleotide triplets and the amino acids is called:
- translation
- transcription
- replication
- a genetic code
Match the column I with column II and mark the appropriate choice
| Column I | Column II |
|---|---|
| (A) Peptide linkage | (i) Inversion |
| (B) Nucleic acid | (ii) Polysaccharide |
| (C) Hydrolysis of cane sugar | (iii) Proteins |
| (D) Starch | (iv) Nucleotides |
- (A) $\rightarrow$ (i); (B) $\rightarrow$ (i); (C) $\rightarrow$ (iii); (D) $\rightarrow$ (iv)
- (A) $\rightarrow$ (iv); (B) $\rightarrow$ (i); (C) $\rightarrow$ (ii); (D) $\rightarrow$ (iii)
- (A) $\rightarrow$ (iii); (B) $\rightarrow$ (iv); (C) $\rightarrow$ (i); (D) $\rightarrow$ (ii)
- (A) $\rightarrow$ (i); (B) $\rightarrow$ (iii); (C) $\rightarrow$ (iv); (D) $\rightarrow$ (ii)
RNA molecules are of three types which are based on their different functions. These are:
- messenger RNA, translational RNA, structural RNA
- cytosine RNA, nucleoside RNA, nucleotide RNA
- messenger RNA, ribosomal RNA, transfer RNA
- primary RNA, secondary RNA, tertiary RNA
Maximum amount of RNA is found in:
- nucleolus.
- chloroplast.
- ribosomes.
- cytoplasm.
When adenine is attached to ribose sugar, it is called adenosine. To make a nucleotide from it, it would require?
- Oxygenation
- Addition of a base
- Addition of phosphate
- Hydrogenation