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प्रश्न
Given below is a schematic diagram of a portion of DNA.
- How many strands are shown in the diagram?
- How many nucleotides have been shown in each strand?
- Name the parts numbered 1, 2, 3, 4 and 5 respectively.
- Name the DNA unit constituted by the parts 1, 2, 3 collectively.
उत्तर
- Two parallel strands.
- Two on each strand.
- (1) Phosphate, (2) Sugar, (3) Pyrimidines, (4) Hydrogen Bond and (5) Purines.
- Nucleotides.
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संबंधित प्रश्न
Chromosomes get aligned at the centre of the cell during:
A. Metaphase
B. Anaphase
C. Prophase
D. Telophase
Give appropriate biological or technical terms for the following :
The condition in which a pair of chromosomes carries similar alleles of a particular character.
Choose the best option out of the four alternatives a, b, c and d
Question 1:
The number of chromosomes in a certain type of cell division is halved. This kind of cell
division occurs in.
(a) Only testis
(b) Only ovary
(c) Both ovary and testis
(d) All body cells
State the difference between:
Chromosome and chromatid:
Choose the correct answer:
During mitosis which of the following disintegrate ___________
Mention the contribution of the scientist given below in the study of chromosome:
Balbiani
Mention the contribution of the scientist given below in the study of chromosome:
Waldeyer
Mention the contribution of the scientist given below in the study of chromosome:
Sutton and Boveri
Write a sentence of the following:
Telomere
Give Technical Terms
The stage at which the formation of chiasmata occurs.
Complete the following sentence with appropriate word :
Chromosomes are _________ material.
Write the functional activity of the following structure:
Spindle fibers
Name the following:
Cells having a single set of chromosomes.
Complete the following sentence with appropriate word:
The number of chromosomes in humans is ________.
Identify the odd one:-
The centromere is found at the centre of the ______ chromosome.
______ is a sudden permanent heritable change that can occur in the gene, in the chromosome or chromosome number.
Which of the following is TRUE with respect to the genes which inherit together during crossing over?
Define the following term:
Chromatid
