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TLS Online TPP Program

#Question id: 2001

A researcher is analyzing the immune response of a patient following the patientʹs exposure to an unknown agent while out of the country. The patientʹs blood is found to have a high proportion of lymphocytes with CD8 surface proteins. What is the likely cause?

#Unit 4. Cell Communication and Cell Signaling

  1. The patient encountered a bacterial infection which elicited CD8 marked T cells.

  2. The disease must have been caused by a multicellular parasite, such as can be encountered in polluted water sources.

  3. The CD8 proteins would be discharged from these lymphocytes to lyse the infected cells.

  4. The CD8 proteins marked the surfaces of cytotoxic T cells to attack virus-infected host cells.

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TLS Online TPP Program

#Question id: 4396

#Unit 3. Fundamental Processes

It is suspected that a novel protein only interacts with the promoter region of a gene. Which of the following techniques should be used to confirm this suspicion?

A. EMSA

B. DNase footprinting

C. Filter binding

D. Gel mobility shift assay
TLS Online TPP Program

#Question id: 18945

#Unit 13. Methods in Biology

PCR can be used to generate single-stranded copies of a DNA sequence; this is called
TLS Online TPP Program

#Question id: 7184

#Unit 5. Developmental Biology

The figure above represents a late zebrafish gastrula. The following concepts may be proposed during further development of the embryo.

A. The concentration of FGF decreases from the yolk towards the epidermis, along with the increase of BMP activity from the dorsal to the ventral axis.

B. Increase in FGF activity in the epidermis with concomitant decrease in BMP activity towards the ventral axis.

C. Neural induction in zebrafish is independent of the organizer and depends on activation of BMP signalling.

D. In comparison, both Xenopus and chick embryos require activation of FGF for neural induction to occur in addition to BMP inhibition.

Which of the above statements are incorrect?
TLS Online TPP Program

#Question id: 1902

#Unit 4. Cell Communication and Cell Signaling

Graft vs host disease occurs on injecting adult T-cells of strain A into:
TLS Online TPP Program

#Question id: 4872

#Unit 8. Inheritance Biology

F1 heterozygous females are test-crossed with males and produced 1800 progeny The interference between these genes is 0.4. What number is of observe double cross over?