Practice Questions

TLS Online TPP Program

#Question id: 2922

Human genes/proteins that regulate the cell cycle are most easily isolated by:

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

biochemical purification.
complementation of Xenopus mutants.
complementation of yeast mutants.
positional cloning.

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TLS Online TPP Program

#Question id: 805

#SCPH05 I Biotechnology

miRNAs are encoded in the genome as segments of longer transcripts. Their characteristic structure helps identify them and predict the target genes they might regulate. Which of the following are the characteristic features of these small RNA molecules?

I. The functional form of an miRNA is typically 21 or 22 nucleotides (it can vary from 19 to 25 nucleotides).

II. The first cleavage liberates the stem-loop, called the pre-miRNA; the second generates the mature miRNA from the pre-miRNA.

III. The pre-miRNAs can be encoded by any part of a transcript: that is, they might fall within coding regions, within leader regions, or within Introns.

IV. The base pairing between miRNA and target RNA is initiated by interactions of so-called seed residues—the sequence between bases 2 and 9 of the 22-nucleotide miRNA.

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#Question id: 2287

#SCPH05 I Biotechnology

Which characteristic do eukaryotic and prokaryotic flagella have in common?

TLS Online TPP Program

#Question id: 3024

#SCPH28 | Zoology

In a rapidly multiplying bacterial population, cell numbers increase

TLS Online TPP Program

#Question id: 8893

#SCPH06 I Botany

While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The student rears some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The embryo develops into a trochophore larva and eventually has a true coelom. These eggs probably belonged to a(n)