EASY
Earn 100
Assertion: Cell wall is not found in an animal cell.
Reason: Animal cells are covered by the cell membrane.
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Important Questions on Cell Theory and Cell as the Basic Unit of Life
EASY
Root pressure is usually acidic because:
MEDIUM
Microtubules are the constituents of:
MEDIUM
Identify the correct order of organization of genetic material from largest to smallest :
EASY
Which one of the following is not applicable to RNA?
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Which of the following processes leads to DNA ladder formation?
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Chromatophores take part in:
MEDIUM
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
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?
HARD
Presence of plastids in Plasmodium suggests:
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The size of Pleuropneumonia-like Organism is:
MEDIUM
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
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 |
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Proteins and are associated with an intact organellar membrane in a cell. If the intact organelle is treated with a high ionic strength buffer, only protein remained associated with the membrane fraction. Based on this, one could conclude that:
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If you suspect major deficiency of antibodies in a person, to which of the following would you like for confirmation evidence?
MEDIUM
The molecular weight of E coil. DNA is . The average molecular weight of the nucleotide pair is 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
In sea urchin DNA, which is double-stranded, of the bases were shown to be cytosine. What are the percentages of other three bases expected to be present in this DNA?
HARD
Nuclear envelope is a derivative of:
MEDIUM
Fertilization in humans is practically feasible only if:
EASY
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
Which of the following pair of organelles does not contain DNA?
