Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 47490
TLS Online TPP Program

#Question id: 3872

Processing of a primary mRNA transcript in a eukaryotic cell does not normally involve:

#SCPH28 | Zoology

  1. attachment of a long poly(A) sequence at the 3' end.

  2. conversion of normal bases to modified bases, such as inosine and pseudouridine.

  3. excision of intervening sequences (introns).

  4. joining of exons.

More Questions
TLS Online TPP Program

#Question id: 13059

#SCPH06 I Botany

Precision will be reduced, but yield will be increased
Optimisation of a PCR reaction is often a compromise between the competing demands for precision, efficiency and yield. Although the specific effects may vary, generally, increasing the annealing temperature will increase non-specific primer binding and reduce precision. Increasing the length of the elongation phase will reduce the proportion of incomplete newly-synthesised strands and therefore increase yield. In this case, the potential effect on efficiency is unclear. Increasing the elongation phase would increase the reaction time, but the time taken to ramp down to a lower annealing temperature would be reduced.
Efficiency during ligation of blunt ended insert and vector cannot be cannot be enhanced by means of…..
TLS Online TPP Program

#Question id: 4570

#SCPH28 | Zoology

Which pair would probably have agreed with the process that is depicted by this tree?
TLS Online TPP Program

#Question id: 20538

#SCPH01 Biochemistry

Aromatic hydrocarbons including benzene, toluene, ethylbenzene and xylene collectively referred as BTEX compounds. Which of them is considered as carcinogenic?
TLS Online TPP Program

#Question id: 9276

#I Life Science/ Life Sciences Group – I-V

The carotenoid b-carotene, whose structure and absorption spectrum at,
TLS Online TPP Program

#Question id: 10524

#I Life Science/ Life Sciences Group – I-V

Members of the Poaceae family, which includes all of the cereal crops, use benzoxazinoids, these alkaloids shows;

a) Alkaloids are derived from the tryptophan as constitutively produced defensive secondary metabolites

b) These benzoxazinoids such as DIBOA and its derivative DIMBOA are usually stored in the peroxisome

c) Upon damage, the inactive glycosides are hydrolyzed, generating glucosinolate, which are toxic not only to insect herbivores but also against pathogens

d) DIBOA and DIMBOA perform insecticidal and pesticidal activities

e) It can be inactivated by hydroxylation and N-glycosylation reactions

Which of the following combination is correct about benzoxazinoids alkaloids?