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Cell_ The Unit Of Life

214 Questions Start Allen Test
All Exams Allen
Q151 Allen 10. NCERT BASED QUESTIONS MCQ
The figure given below shows the structure of plasma membrane, with its parts labelled from A to E, Identify the correct :-
A.
A → 52 percent of erythrocyte membrane
B.
B and E → Movement of these can be measured as fluidity of membrane
C.
C → Help in facilitated transport of polar molecules
D.
D → Its polar tail contains saturated hydrocarbons
Q152 Allen 10. NCERT BASED QUESTIONS MCQ
Contractile vacuole :- Q. No. 3 to 7 are based on given diagram :-
A.
is a membrane less structure
B.
is formed by engulfing the food
C.
is important for osmoregulation
D.
is called suicidal bag of cell
Q153 Allen 10. NCERT BASED QUESTIONS MCQ
Which represents aqueous compartments?
A.
A, B
B.
D, C
C.
A, D
D.
B, D
Q154 Allen 10. NCERT BASED QUESTIONS MCQ
What is the average value of labelled F?
A.
0.2 μm
B.
0.5 μm
C.
1.0 μm
D.
4.1 μm
Q155 Allen 10. NCERT BASED QUESTIONS MCQ
Cristae are infoldings of ......., present toward the ......
A.
E and B
B.
B and C
C.
C and D
D.
F and D
Q156 Allen 10. NCERT BASED QUESTIONS MCQ
Single, circular DNA molecule is found in :-
A.
B
B.
D
C.
E
D.
C
Q157 Allen 10. NCERT BASED QUESTIONS MCQ
D contains :-
(i) few RNA molecules (ii) 70s ribosome
(iii) Enzymes (iv) Circular DNA
A.
ii, iv
B.
i, ii, iv
C.
ii, iii, iv
D.
i, ii, iii, iv
Q158 Allen 10. NCERT BASED QUESTIONS MCQ
(a) granular structure
(b) first observed under the electron microscope as dense particles by George Palade
(c) composed of RNA and proteins
(d) not surrounded by any membrane
Above given statements are true for which cell organelle?
Options :-
A.
Nucleolus
B.
Ribosome
C.
Lysosome
D.
Chloroplast
Q159 Allen 10. NCERT BASED QUESTIONS MCQ
Find incorrect statement with regard to centrosome and centrioles :-
(a) Centrosome is surrounded by amorphous pericentriolar material
(b) In centrosome, both centrioles lie parallel to each other in which each has an organisation like the cartwheel
(c) Centrioles are made up of nine unevenly spaced peripheral fibrils of tubulin
(d) Hub is the central proteinaceous part of centriole
(e) Proteinaceous radial spokes connect hub to peripheral triplets
Options :-
A.
a, b, e
B.
only b
C.
b, c
D.
All are correct
Q160 Allen 10. NCERT BASED QUESTIONS MCQ
....observed that all plant tissues are made up of cells. At the same time......, studied different type of animal cells.
A.
Rudolf Virchow and Robert Brown respectively
B.
Mathias Schleiden and Theodore Schwann respectively
C.
Theodore Schwann and Mathias Schleiden respectively
D.
Robert Hooke and Schleiden respectively
Q161 Allen 10. NCERT BASED QUESTIONS MCQ
According to fluid-mosaic model, the quasi-fluid nature of.....enables lateral movement of.....within the overall bilayer. This ability to move within the membrane is measured as its...
(i) Carbohydrates (ii) Lipids
(iii) Proteins (iv) Fluidity
(v) Selective permeability
Correct sequence is :-
A.
ii, iii, iv
B.
iii, i, iv
C.
iii, ii, v
D.
i, ii, iv
Q162 Allen 10. NCERT BASED QUESTIONS MCQ
One of the most important functions of the plasma membrane is :-
A.
Formation of nuclear membrane
B.
Transport of molecules across it
C.
Exocytosis
D.
Detoxification
Q163 Allen 10. NCERT BASED QUESTIONS MCQ
....can not pass through the lipid bilayer, they require a carrier protein of the membrane to facilitate their transport across the membrane
A.
Nonpolar molecules
B.
Polar molecules
C.
Hydrophobic molecules
D.
Both (2) and (3)
Q164 Allen 10. NCERT BASED QUESTIONS MCQ
Na $^{+}$ /K $^{+}$ pump is an example of :-
A.
Passive transport
B.
Osmosis
C.
Active transport
D.
Simple diffusion
Q165 Allen 10. NCERT BASED QUESTIONS MCQ
Mark the incorrect match for transport of molecules across the membrane :-
A.
Neutral solute – simple diffusion
B.
Water – osmosis
C.
Non-polar molecules – facilitate diffusion
D.
ATP utilized – active transport BCL157
Q166 Allen 10. NCERT BASED QUESTIONS MCQ
Mitochondria :-
(a) are easily visible under the microscope
(without specifically stained)
(b) are typically sausage-shaped or
cylindrical
(c) are double membrane bound structures
(d) have two aqueous compartments
Options :-
A.
a, d correct and b, c incorrect
B.
a, b correct and c, d incorrect
C.
a incorrect and b, c, d correct
D.
a, d incorrect and b, c correct
Q167 Allen 10. NCERT BASED QUESTIONS MCQ
Inner mitochondrial membrane forms infoldings called :-
A.
Thylakoid
B.
Cisternae
C.
Oxysomes
D.
Cristae
Q168 Allen 10. NCERT BASED QUESTIONS MCQ
The number of mitochondria per cell is variable, depending on :-
A.
Size of cells
B.
Shape of cells
C.
Physiological activity of cells
D.
Type of genes present in mitochondrial DNA
Q169 Allen 10. NCERT BASED QUESTIONS MCQ
Which one of the following is not a component of endomembrane system?
(a) Endoplasmic reticulum
(b) Golgi body (c) Lysosome
(d) Vacuole (e) Nucleus
Options :-
A.
Both a and c
B.
Only c
C.
d and e both
D.
Only e
Q170 Allen 10. NCERT BASED QUESTIONS MCQ
Membrane bound vesicular structures formed by the process of packaging in the Golgi apparatus and filled with hydrolytic enzymes, are called :-
A.
Contractile vacuoles
B.
Food vacuoles
C.
Lysosomes
D.
Centrosome BCL162
Q171 Allen 10. NCERT BASED QUESTIONS MCQ
Eukaryotes have 80S, while prokaryotes have 70S ribosomes in cytoplasm. Here "S": (a) denotes sedimentation coefficient (b) is an indirect measure of density (c) is an indirect measure of size Options :-
A.
a only
B.
a and b only
C.
b and c only
D.
a, b and c
Q172 Allen 10. NCERT BASED QUESTIONS MCQ
In r-RNA, "r" stands for :-
A.
Reversible
B.
Ribozyme
C.
Ribosomal
D.
Recognition
Q173 Allen 10. NCERT BASED QUESTIONS MCQ
Interphase nucleus has a loose and indistinct network of nucleoprotein fibres called chromatin, but during different stages of cell division, cells show "structured chromosomes" in place of the:-
A.
Nucleus
B.
Plastids
C.
Mitochondria
D.
Vacuole
Q174 Allen 10. NCERT BASED QUESTIONS MCQ
Space between parallel nuclear membranes is called perinuclear space which is :-
A.
10–50 nm
B.
0.1 – 0.4 μm
C.
10 – 50 Å
D.
1 – 4 nm
Q175 Allen 10. NCERT BASED QUESTIONS MCQ
A single human cell has approximately ..... long thread of DNA distributed among its ..... chromosomes:-
A.
2 cm, 46
B.
2 metre, 46
C.
2 cm, 23
D.
2 metre, 23