NEET Practice Questions (MCQs) with Answers & Solutions

DNA fingerprinting is a technique used to identify individuals by characteristics of their DNA. It has found immense use in solving cases of disputed parentage as it can accurately determine biological relationships by comparing genetic markers.

Agarose, a polysaccharide extracted from seaweed, is widely used in gel electrophoresis. This technique is essential in molecular biology for the separation of DNA or RNA fragments based on size. Agarose gel electrophoresis helps visualize and analyze nucleic acids.

Coliform bacteria are typically used as an indicator of sanitary quality of foods and water, not for the production of vinegar. Vinegar is produced by acetic acid bacteria, not coliforms.

Transgenic mice are being developed for use in
testing the safety of vaccines before they are used on humans.
Transgenic mice are being used to test the safety of the polio vaccine.
If successful and found to be reliable, they could replace the use of
monkeys to test the safety of batches of the vaccine

For cellular growth, it is essential to have an increase in cell mass, duplication of genetic material, and a division process that ensures each daughter cell receives an equal complement of genetic material. This ensures proper cell function and replication.

Cell reproduction typically starts with a single cell. This single cell undergoes various stages of the cell cycle to divide and produce new cells. This concept is fundamental in understanding cellular biology and the process of growth and reproduction in organisms.

Cytochrome c is a mobile electron carrier

The cell enters mitosis at the end of the G2 phase. The G2 phase is the final subphase in interphase, directly preceding mitosis. This is the period during which the cell checks for DNA damage and completes the replication of its DNA, ensuring that everything is in order before it divides.

The correct sequence of the cell cycle is G1, S, G2, M. In the G1 phase, the cell grows and performs its normal functions. In the S phase, DNA replication occurs. During the G2 phase, the cell prepares for mitosis by producing the proteins and organelles necessary for cell division. Finally, in the M phase, mitosis and cytokinesis occur, resulting in two daughter cells.