Which of the following statement is incorrect?

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Important Questions on Cell : The Unit of Life

EASY

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

Which one of the following cell organelles are enclosed by a single membrane?

MEDIUM

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

Microtubules are the constituents of:

EASY

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

In a chloroplast the highest number of protons are found in:

EASY

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

Which of the following are not membrane-bound?

MEDIUM

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

Match the following organelles in Group I with the structures in Group II. Choose the correct combination.

Group I	Group II
P. Mitochondrion	i. Cisternae
Q. Golgi	ii. Cristae
R. Chloroplast	iii. Thylakoids
S. Centrosome	iv. Radial spokes

EASY

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

A protoplast is a cell:

MEDIUM

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

Mitochondria and chloroplast are:

(i) Semi - autonomous organelles

(ii) Formed by the division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery

Which one of the following option is correct?

EASY

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

Proteins

P, Q,

and

R

are associated with an intact organellar membrane in a cell. If the intact organelle is treated with a high ionic strength buffer, only protein

R

remained associated with the membrane fraction. Based on this, one could conclude that:

EASY

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

A line is drawn from the exterior of an animal cell to the centre of the nucleus, crossing through one mitochondrion. What is the minimum number of membrane bilayers that the line will cross?

MEDIUM

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

Select the incorrect statements from the following
I) In plasma membrane, hydrophilic polar heads of lipids arrange towards the outside and the hydrophobic tail towards the inner side
II) In the plasma membrane, peripheral proteins lie on the surface of the membrane while the integrated proteins are not buried in the membrane
III) Neutral solutes may move across the membrane by the process of simple diffusion against the concentration gradient
IV) Polar molecules can pass through the non-polar lipid bilayer and do not require a carrier protein

MEDIUM

Biology>Cell : Structure and Functions>Cell : The Unit of Life>An Overview of a Cell

Match the columns and identify the correct option.

	Column I		Column II
A	Thylakoids	(i)	Disc-shaped sacs in Golgi apparatus
B	Cristae	(ii)	Condensed structure of DNA
C	Cisternae	(iii)	Flat membranous sacs in stroma
D	Chromatin	(iv)	Infoldings in mitochondria