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What is the formula for calculating total magnification of a compound microscope?

Important Questions on Cell Structure

MEDIUM
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
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:
EASY
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Which one of the following is not applicable to RNA?
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Biology>Cell Biology P1>Cell Structure>Electron Microscopy
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:
MEDIUM
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
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?
MEDIUM
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Identify the correct order of organization of genetic material from largest to smallest :
HARD
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Nuclear envelope is a derivative of:
MEDIUM
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
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
EASY
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
The equivalent of a structural gene is:
EASY
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Root pressure is usually acidic because:
EASY
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
If you suspect major deficiency of antibodies in a person, to which of the following would you like for confirmation evidence?
HARD
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Gene regulation governing lactose operon of E. coli that involves the lac I gene product is:
MEDIUM
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Microtubules are the constituents of:
HARD
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Select the correct matching in the following pairs:
EASY
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
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 Biology P1>Cell Structure>Electron Microscopy
Which one of the following is not an inclusion body found in prokaryotes?
MEDIUM
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Select the mismatch.
MEDIUM
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Select the wrong statement.
EASY
Biology>Cell Biology P1>Cell Structure>Electron Microscopy
Chromatophores take part in:
MEDIUM
Biology>Cell Biology P1>Cell Structure>Electron Microscopy

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 Biology P1>Cell Structure>Electron Microscopy
Fertilization in humans is practically feasible only if: