MCQ on Chromosomes:
1. The thread-like structures, which appear inside the nucleus at the time of cell division, are called __________.
(1) Asters
(2) Centrioles
(3) Chromosomes
(4) Spindle fibers
Answer: c
2. The term chromosome was coined by___________
(1) Sutton
(2) Boveri
(3) Waldeyer
(4) Hoffmeister
Answer: c
3. Chromosomes were first observed by___________.
(1) Fleming
(2) Waldeyer
(3) Strasburger
(4) Hoffmeister
Answer: d
4. Who proposed the chromosomal theory of inheritance?
(1) Sutton & Boveri
(2) Correns
(3) Both (a) and (b)
(4) None of these
Answer: a
5. The main components of chromosomes are
(1) proteins and enzymes
(2) proteins and phospholipids
(3) protein and DNA
(4) Protein and RNA
Answer: c
6. The chromosomes contained in human sperm are
(1) 44+XY
(2) 23+X or 23+Y
(3) 22+X or 22+Y
(4) 44+XX
Answer: c
7. The centromere is that part of the chromosome where___________.
(1) Nicking occurs
(2) Chromatids are attached
(3) Nucleoli are formed
(4) Crossing-over takes place
Answer: b
8. The human haploid genome is composed of ______ DNA molecules
(1) 23 pairs of homologous chromosomes
(2) 23 pairs of homologous chromosomes, one for each
(3)22 autosomes and XY chromosomes
(4) all in cells
Answer: 3
9. The lowest level of chromosome organization is_______
(1) Nuclei
(2) Nucleus
(3) Nucleotide
(4) Nucleosome
Answer: 4
10. Which of the following living species comprises more than 200 chromosomes?
(1) Amoeba.
(2) Buffalo.
(3) Chicken.
(4) Giraffe.
Answer: 1
11. Which of the following statements about chromosomes is incorrect_______
(1) The number and shape of chromosomes must be the same between any two sets of chromosomes in a somatic cell
(2) A chromosome group must contain all the information on individual growth, development, and genetic variation
(3) Chromosomes with different shapes and sizes in a chromosome group are called non-homologous chromosomes
(4) If a somatic cell contains an odd number of chromosome sets, it is unlikely to produce normally fertile gametes
Answer: A
12. How many sex chromosomes are present in a human being?
(1) 1 pair
(2) 2 pairs
(3) 3 pairs
(4) 4 pairs
Answer: 1
13. Why are chromosomes condensed?
(1) To facilitate accommodation
(2) Always condensed
(3) To facilitate cell division
(4) To facilitate distribution in daughter cells
Answer: 4
14. Which of the following statements is true about the ends of the chromosome?
(1) The ends of the chromosome are called Satellites
(2) The ends of the chromosome are called Centromere
(3) The ends of the chromosome are called Telomeres
(4) The ends of the chromosome are called Kinetochore
Answer: 3
15. How many autosomes are present in a human being?
(1) 20 pairs
(2) 22 pairs
(3) 23 pairs
(4) 44 pairs
Answer: 2
16. What is chromosome walking?
(1) Chromosome walking is a hybridization technique that uses an overlapping probe of the neighboring region of the chromosome for the purpose of cloning.
(2) Chromosome walking is a technique used to clone a gene
(3) Both of these
(4) none of the above
Answer: 3