Practice Questions

TLS Online TPP Program

#Question id: 4314

A researcher introduces double-stranded RNA into a culture of mammalian cells and can identify its location or that of its smaller subsections experimentally, using a fluorescent probe. Some time later, she finds that the introduced strand separates into single-stranded RNAs, one of which is degraded. What does this enable the remaining strand to do?

#Unit 3. Fundamental Processes

attach to histones in the chromatin
bind to complementary regions of target mRNAs
activate other siRNAs in the cell
bind to noncomplementary RNA sequences

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TLS Online TPP Program

#Question id: 29114

#Unit 8. Inheritance Biology

Given below, is the result of a complementation test for six independent mutants (1 to 6)

TLS Online TPP Program

#Question id: 29115

#Unit 8. Inheritance Biology

Given below, is the result of a complementation test for seven independent mutants (A to G). '+' represents complementation; '_' represents non complementation. Based on the above, which one of the following conclusions is correct

a) The mutations can be ordered in a three cistron as A-G-B-C-D-E-F

b) All mutations belong to a single cistron, but their order cannot be determined.

c) There are three cistrons, mutations A and G represent one cistron, B, C and D represent the second cistron and E and F represents the third cistron.

d) There are three linkage groups, mutations A and G represent linkage group-I, B, C and D represent linkage group-II, and E and F represents linkage group-III

TLS Online TPP Program

#Question id: 29116

#Unit 6. System Physiology – Plant

Which one of the following is the correct order of during light reaction in the thylakoid membrane of chloroplast

TLS Online TPP Program

#Question id: 29117

#Unit 6. System Physiology – Plant

Light reactions of photosynthesis are carried out by four major protein complexes: Photosystem I (PSI), photosystem II (PSII), the cytochrome b6f complex and ATP synthase. The following are certain statements on PSII:

a. Red light absorbed by photosystem II (PSII) produces a strong oxidant and a weak reductant.

b. Far-red light absorbed by photosystem II (PSI) produces a weak oxidant and a strong reductant.

c. The strong oxidant generated by PSII oxidizes water,

d. The strong reductant generated by PSII oxidizes water