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Class 12 Biology - Objective Questions with Answers

Questions
6 The chromosomes as thread like structures in nucleus was first described by:
A Mendel
B Strasburger
C Darwin
D Levitzky

Answer: Option [B]

The correct answer is Strasburger. Strasburger in 1875 first observed chromosome during cell division and described chromosomes as thread like structures in nucleus.

7 Genes are made up of:
A Histones
B Lipoproteins
C Polynucleotides
D Hydrocarbons

Answer: Option [C]
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8 The function of chrosomes of carrying genetic information from cell generation to another is performed by:
A RNA
B DNA
C Histones
D Calcium

Answer: Option [B]

Genes are made up of polynucleotides. A polynucleotide molecule is a biopolymer composed of 13 or more nucleotide monomers covalently bonded in a chain. DNA and RNA are examples of polynucleotides with distinct biological function.

9 In chrosomes, the material controlling heredity is
A DNA
B Histones
C Chromocentres
D RNA

Answer: Option [A]

The correct answer is DNA. DNA results in the formation of RNA which results in the formation of proteins and thus decides the phenotype. Thus, the component of a chromosome that controls heredity and inheritance is DNA.

10 The term 'gene' refers to:
A A portion of RNA
B A linkage group
C A portions of DNA
D A sequence of Amino

Answer: Option [C]

The term 'gene' refers to a portions of DNA. Genes are made up of sequences of DNA and are arranged, one after another, at specific locations on chromosomes in the nucleus of cells.

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