Which of the following can lead to loss-of-heterozygosity in a tumor-suppressor gene?

a. deletion of the normal copy                       

b. non dysjunction during mitosis

c. somatic mutation of the normal copy

d. mitotic recombination between a wild-type and mutant allele

TLS Online TPP Program

#Question id: 1048

#Unit 4. Cell Communication and Cell Signaling

A virion is composed of

TLS Online TPP Program

#Question id: 20328

#Unit 4. Cell Communication and Cell Signaling

Acyl-homomserine lactones (AHLs) are auto-inducers used by Gram-negative bacteria to communicate. Which statements are about that Quorum sensing signaling in bacteria. 

a. transcription is activated at low cell density

b. transcription is not activated at low cell density

c. transcription is activated at high cell density

d. transcription is not activated at high cell density

e. Upon reaching a threshold concentration, AHL can bind to its receptor LuxR.

f. Upon reaching a threshold concentration, AHL can bind to Lux box.

TLS Online TPP Program

#Question id: 1107

#Unit 4. Cell Communication and Cell Signaling

Viagra causes dilation of blood vessels and increased blood flow to the penis, facilitating erection. Viagra acts by inhibiting which of the following events?

TLS Online TPP Program

#Question id: 19221

#Unit 12. Applied Biology

Which gene is added downstream from the left border to prevent unwanted vector DNA past the left border from being incorporated into transgenic plants.

TLS Online TPP Program

#Question id: 18372

#Unit 12. Applied Biology

Which enzyme is used to degrade of chlorinated solvents and pesticides present in soil makes the soil contaminated