Biology
Correct the following statements for mistakes, if any.
(a) The four nitrogenous bases in the DNA are Guanine, Thiamine, Adrenaline and Cytosine.
(b) Genes are specific sequences of bases on a chromosome.
(c) A nucleotide is composed of a sulphate, a sugar (pentose) and a nitrogenous base.
(d) Nucleosomes are groups of cysteine molecules surrounded by DNA strands.
(e) If there are 46 chromosomes in a cell, there will be 23 chromatin fibres inside the nucleus during interphase.
Chromosomes
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Answer
Corrected statements are as follows:
(a) The four nitrogenous bases in the DNA are Guanine, Thymine, Adenine and Cytosine.
(b) Genes are specific sequences of nucleotides on a chromosome.
(c) A nucleotide is composed of a phosphate, a sugar (pentose) and a nitrogenous base.
(d) Nucleosomes are groups of histone molecules surrounded by DNA strands.
(e) If there are 46 chromosomes in a cell there will be 46 chromatin fibres inside the nucleus during interphase.
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Related Questions
Name these:
(a) Two main constituents of Chromatin
(b) Two kinds of Nucleic acids
(c) Three components of a Nucleotide
(d) Four Nitrogenous bases
(e) Two kinds of Nitrogenous bases
(f) Two components of Nucleosome
(g) Two kinds of Cell division
(h) Four main phases of Karyokinesis
(i) Two steps of the process Mitosis
(j) Two kinds of haploid cells of human body
What are the rungs of the "DNA ladder" made of?
Define the following terms:
(a) Chromosome
(b) Gene
(c) Cell division
(d) Chromatid
(e) Aster
Give reason:
(a) Gametes must be produced by meiosis for sexual reproduction.
(b) Why is meiosis referred to as 'reductional division'?
(c) The children of the same parents, howsoever similar, are different from each other in certain aspects.