Practice Questions

TLS Online TPP Program

#Question id: 766

With respect to microRNAs, which, if any, of the following statements, is true?

#SCPH05 I Biotechnology

MicroRNA is a generic term that covers all tiny RNAs, ones that are less than 35 nucleotides long when mature.
MicroRNA genes often occur in gene clusters within introns of protein-coding genes and are usually transcribed by RNA polymerase II.
MicroRNAs regulate target genes by binding to complementary sequences on one DNA strand of the target gene.
MicroRNAs normally regulate the expression of just a single target gene.

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TLS Online TPP Program

#Question id: 570

#SCPH05 I Biotechnology

Which of the following is true for allosteric enzymes

TLS Online TPP Program

#Question id: 3021

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

The lag phase of the bacterial growth curve is marked by

TLS Online TPP Program

#Question id: 15618

#SCPH01 Biochemistry

Wild type E. coli metabolizes the sugar lactose by expressing the enzyme ß-galactosidase. You have isolated a mutant that you call lac1-, which cannot synthesize ß-galactosidase and cannot grow on lactose (Lac-). During an condition isolate a second Lac– mutation, which you designate lac2-. Using P1 phage on this strain and use the resulting phage lysate to infect the lac2- strain, selecting for Kanr transductants. In this case, all 100 Kanr transductants that are examined are Lac–. What does this result tell you about the relationship between the lac1- and lac2- mutations?

TLS Online TPP Program

#Question id: 16322

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

Immediately after putting on a shirt, your skin might feel itchy. However, this perception soon fades due to ________.

TLS Online TPP Program

#Question id: 929

#SCPH01 Biochemistry

During B oxidation of fatty acids, ___________ is produced in peroxisomes but not in mitochondria.