1) Choose the correctly matched pairs and the correct option
a) Leptotene-chromosomes become invisible
b) Zygotene- pairing of homologous chromosomes
c) Pachytene-Dissolution of synaptonemal complex takes place
d) Diplotene Bivalent chromosomes appear as tetrads
e) Diakinefis terminalisation of chiasmata takes place
A) a,b correct
B) a,d correct
C) b,e correct
D)b,c correct
2) Which is not a characteristic of telophase ?
1) Chromatin condenses to form chromosomes
2) Nucleolus, Golgi complex and ER reform
3) Nuclear envelope assemble around chromosome clusters
4) Centromeres split and chromatids separate
5) Chromosome clusters and their identity is lost
A) 1,2,4 only
B) 1, 4 only
B) C) 2,3 only
D) 3,4,5 only
3) In onion root tip during metaphase stage of mitosis the number of kinetochores will be
A) 4
B) 8
C) 16
D) 32
4) A bacteria divides in every one minute. A cup is filled in one hour. Time taken to fill one- fourth cup is
A) 30 minutes
B) 59 minutes
C) 29 minutes
D) 58 minutes
5) During which phase (s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C
A) G 2 and M
B) G 0 & G 1
C) G 1 & S
D) only G 2
6) The centromere or primary constriction of the chromosome contains rings of proteins that are intimately associated with a spindle fibre. These are called
A) Centrioles
B) Secondary constrictions
C) Asters
D) Kinetochores
7) Which of the following processes takes place during pachytene stage of meiosis ?
A) Appearance of recombinationnodules
B) Formation of synaptonemal complexes
C) Dissolution of synaptonemal complexes
D) Terminalisation of chiasmata
8) In S phase, the amount of DNA
A) As well as number of chromosomes doubles in each cell
B) Doubles but number of chromosomes remains same in each cell
C) And number of chromosomes remain unchanged in each cell , but amount of protein doubles
D) Remains same in each cell but number of chromosomes doubles
9) A somatic cell that has just completed the S phase of its cell cycle , as compared to gamete of the same species has
A) Twice the number of chromosomes and four times the amount of DNA
B) Four times the number of chromosomes and twice the amount of DNA
C) Twice the number of chromosom es and twice the amount of DNA
D) Same number of chromosomes and twice the amount of DNA
10) Spindle fibre attach onto
A) Telomere of the chromosomes
B) Kinetochore of the chromosome
C) Centromere of the chromosome
D) Kinetosome of the chromosome
11) A bivalent of meiosis I consists of
A) Four chromatids and two centromeres
B) Two chromatids and one centromeres
C) Two chromatids and two Centromeres
D) Four chromatids and four centromeres
12) Synaptonemal complex is site of
A) Spindle attachment
B) Replication
C) Chromatid separation
D) Chromosome alignment and recombination
13) In which stage the chromosomes appear thin and long thread like
A) Zygotene
B) Leptotene
C) Pachytene
D) Prophase
14) In meiosis
A) First division is reductional
B) First division is equational
C) Second division is reductional
D) None of the above
15) How many chromosomes will the cell have at it has G 1 after S and after M-phase respectively if it has 14 chromosomes at interphase?
A) 7, 14, 14
B) 14, 14, 14
C) 14 ,14, 7
D) 7 ,7,7
16) G1 stage of interphase of cell cycle shows
A) Active synthesis of DNA
B) Active synthesis of RNA
C) Active synthesis of protein
D) Both B & C
17) A bivalent in metaphase I consists of
A) Two chromatids and one centromere
B) Two chromatids and two centromeres
C) Four chromatids and two centromeres
D) Four chromatids and four centromeres
18) Histone protein synthesis occurs during
A) G 1 phase
B) G 2 -phase
C) S-phase
D) Prophase
19) post-mitotic phase of the cell in which active synthesis of RNA and proteins takes place is
A) S-phase
B) Amitotic phase
C) G 2 -phase
D) G 1 -phase
20) Second division of meiosis is
A) Reductional division
B) Multiplied division
C) Equational division
D) None of the above
21) Zygotic meiosis occurs in
A) Pinus
B) Chlamydomonas
C) Marchantia/Dryopteris
D) All the above
22) Mitotic anaphase differs from metaphase in possessing
A) Same number of chromosomes
and same number of chromatids
B) Half number of chromosomes and half number of chromatids
C) Half number of chromosomes and same number of chromatids
D) Same number of chromosomes and half number of chromatids
Leave a Comment