CSIR NET Weekend Booster Quiz 2022 | Life Science | 13 November

Under a given renaturing condition E. coli DNA reassociates with a Cot ½ of 4.0 and an unknown DNA sample with a Cot ½ of 283. The complexity of this unknown DNA will be

Humans have biconvex lens in the eyes. They can see accurately by focusing on the retina an image of an object situated at a distance say 25 meters, as well as near, say 25 cm. This is because the

Comparative sensitivity of three groups of organisms to single large doses of x-rays or γ-rays delivered at short intervals is shown in the figure below.

The three groups P, Q, R respectively are:

Complete four-chambered heart is present in:

The following demonstrates proposed functions of different genes which determine the decision to become either trophoblast or inner cell mass (ICM) blastomere during early mammalian development:

Based on the above figure, which oneof the following assumptions is correct?

Which class of proteins facilitates coiling of interphase chromosomes?

Interacting genes which are involved in producing continuous variation in phenotypes in a population are known as/constitute

Mass spectrometry is an analytical technique that is used to measure the mass to charge ratio of molecules present in a sample. The sample subjected to mass spectrometry is first ionized to generate parent molecular ions. These ions are then fragmented to produce fragment ions. All the molecules in the sample would then lose an electron and carry a single positive charge. Now all molecules will have the same charge but will differ in their masses which are then measured in mass spectrometry. There are different types of mass spectrometry. Some of them are listed in column I. Match them with their applications in column II.

Following statements are being made regarding specification/ determination during animal development:

i. During the course of commitment, the cell may not appear different from its nearest or most distant neighbors in the embryo and show no visible signs of differentiation; but its developmental fate is restricted.

ii. At the stage of specification, cell commitment is not labile.

iii. A cell or tissue is determined when it is capable of differentiating autonomously even when placed into another region of the embryo, or a cluster of differently specified cells in a petridish.

iv. Cytoskeletal arrangements maintain positioning of nuclei in the syncytium, which enables specification of these nuclei by opposing morphogen gradients namely Bicoid and Caudal in Drosophila.

v. Capacity for “mosaic” development allows cells to acquire different functions as a result of interactions with neighboring cells.

Which of the above statements are correct?

Following information is given for a healthy kidney
(A) Glomerular hydrostatic pressure - 85 mm Hg

(B) Glomerular capillary colloid osmotic pressure - 40 mm Hg

(C) Hydrostatic pressure in the Bowman's capsule - 20mn Hg

The net filtration pressure will be