Multiple Choice QuestionsFive Kingdom system of classification suggested by RH Whittaker is not based on
presence or absence of a well-defined nucleus
mode of reproduction
Mode of nutrition
Mode of nutrition
Archaebacteria differ from eubacteria in
cell membrane structure
mode of nutrition
cell shape
cell shape
Which of the following is responsible for peat formation?
Marchantia
Riccia
Funaria
Funaria
Tracheids differ from other treachery elements
having Casparian strips
being imperforate
lacking nucleus
lacking nucleus
Which structures perform the function of mitochondria in bacteria?
Nucleoid
Ribosomes
Cell wall
Cell wall
The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as
microtubules
microfilaments
intermediate filaments
intermediate filaments
During which phase (s0 of the cell cycle, the amount of DNA in a cell remains at the 4C level if the initial amount is denoted as 2C?
Go and G1
G1 and S
Only G2
Only G2
D.
Only G2
During the S or synthetic phase, the DNA content double, i,e, from 2C to 4C for all diploid cells. The G2 phase follows the S-phase and is called second growth phase or pre-mitotic gap phase. In G2 phase the synthesis of DNA stops, therefore, the DNA level remains 4C if initial was 2C
However, the formation of RNA and protein continues as they are required for the multiplication of cell organelles, spindle formation and cell growth. This amount becomes, half (i.e,) 2C only during anaphase (in mitosis) when chromosomes separate.
Match the following and select the correct answer.
|
Column I |
Column II |
||
|
A. |
Centriole |
1. |
Infolding in mitochondria |
|
B. |
Chlorophyll |
2. |
Thylakoids |
|
C. |
Cristae |
3. |
Nucleic acid |
|
D. |
Ribozymes |
4. |
Basal body cilia of flagella |
|
A |
B |
C |
D |
|
4 |
3 |
1 |
2 |
|
A |
B |
C |
D |
|
1 |
2 |
4 |
3 |
|
A |
B |
C |
D |
|
1 |
3 |
2 |
4 |
|
A |
B |
C |
D |
|
1 |
3 |
2 |
4 |
Dr F went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?
It made possible the isolation and exact identification of auxin
It is the basis for quantitative determination of small amounts of growth - promoting substances
It supports the hypothesis that IAA is auxin
It supports the hypothesis that IAA is auxin
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