EASY
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Which cell organelle is absent in the leaves of onion?

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Important Questions on Cell : The Unit of Life

MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
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>The Cell- An Overview
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?
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
If you suspect major deficiency of antibodies in a person, to which of the following would you like for confirmation evidence?
MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
Which of the following pair of organelles does not contain DNA?
HARD
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
Presence of plastids in Plasmodium suggests:
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
Which one of the following is not applicable to RNA?
MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
Identify the correct order of organization of genetic material from largest to smallest :
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
The schematic below describes the states of the lac operon in the absence of lactose. Which ONE of the following happens when lactose is present in the cell?
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EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
Which of the following processes leads to DNA ladder formation?
MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview

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?

MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
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
MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
Fertilization in humans is practically feasible only if:
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
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>The Cell- An Overview
Chromatophores take part in:
MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
The molecular weight of E coil. DNA is 3.1×109 g/mol. The average molecular weight of the nucleotide pair is 660 g/mol and each nucleotide pair contributes to 0.34 nm to the length of DNA. The length of E coli DNA molecule will be approximately:
MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
In sea urchin DNA, which is double-stranded, 17% of the bases were shown to be cytosine. What are the percentages of other three bases expected to be present in this DNA?
HARD
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
Nuclear envelope is a derivative of:
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
Root pressure is usually acidic because:
MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
Microtubules are the constituents of:
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>The Cell- An Overview
The size of Pleuropneumonia-like Organism (PPLO) is: