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TLS Online TPP Program

#Question id: 1434

A bone tumor sample appears to be heterozygous for a p53 mutation. The most likely explanation for this finding is:

#SCPH28 | Zoology

  1. Mutated p53 is an oncogene.

  2. The p53 mutation is resulting in a dominant negative p53 protein.

  3. The p53 mutation is resulting in a premature stop codon, and no functional protein is made from that allele.

  4. There was a mistake in labeling the tissue sample—all tumors musts lack p53.

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TLS Online TPP Program

#Question id: 15617

#SCPH28 | Zoology

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 you have a wild type (Lac+) strain carrying a Tn5 insertion known to be near several Lac genes on the E. coli chromosome. You grow P1 phage on this strain and use the resulting phage lysate to infect the lac1– strain, selecting for kanamycin resistance (Kanr). Among 100 Kanr transductants, you find that 82 are Lac– and 18 are Lac+. Express the distance between Tn5 and the lac1– mutation as a cotransduction frequency;
TLS Online TPP Program

#Question id: 1624

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

Acute inflammation can be initiated by:
TLS Online TPP Program

#Question id: 19457

#SCPH01 Biochemistry

Which microscopy can be used for viewing live cells and unstained tissues?
1. Fluorescence microscopy
2. Phase contrast microscopy
3. Dark field microscopy
4. Differential interference microscopy
5. Confocal microscopy
Which of the above combinations of microscopy is correct?
TLS Online TPP Program

#Question id: 23251

#SCPH01 Biochemistry

Which enzyme degrades the resulting component dNTPs and ATP if not incorporated in chain.
TLS Online TPP Program

#Question id: 11423

#SCPH28 | Zoology

Our ability to distinguish different biomes under similar conditions in different parts of the world depends primarily on which of the following factors that influence the distributions of growth forms?