The four covalent bonds in methane (CH4) are arranged around carbon to give which one of the following geometries?

TLS Online TPP Program

#Question id: 3619

#SCPH01 Biochemistry

Alleles that are both expressed in a heterozygote are

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#Question id: 2938

#SCPH28 | Zoology

Which of the following inhibit(s) cyclin A/Cdk2 activity?

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#Question id: 15998

#SCPH05 I Biotechnology

For culturing, plasma from the adult chicken is preferred to mammalian plasma because

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#Question id: 1398

#SCPH05 I Biotechnology

Which of the following properties is (are) characteristic of a benign tumor?

a. well differentiated              b. localized to tissue of origin             c. metastatic               

d. promotes angiogenesis        e. surrounded by a fibrous capsule

TLS Online TPP Program

#Question id: 13065

#SCPH05 I Biotechnology

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.

Agglutination of antigens by utilising specific antibodies can only occur, if