Practice Questions

TLS Online TPP Program

#Question id: 5760

The fluctuation test of Luria and Delbruck (studying resistance to bacteriophge T1 infection) established that

#Unit 8. Inheritance Biology

T1 phage was a mutagen.
Mutations could arise prior to the time they were selected
The mutation rate varies greatly from experiment to experiment.
In E. coli the number of mutants per clone was relatively constant.

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TLS Online TPP Program

#Question id: 10943

#Unit 7. System Physiology – Animal

An 8-year-old male is frequently coming to the clinic for persistent skin infections that do not heal within a normal time frame. He had a normal recovery from the measles. Checking his antibodies following immunizations yielded normal antibody responses. A defect in which of the following cells would most like be the cause of the continual infections?

TLS Online TPP Program

#Question id: 24178

#General Aptitude

More and more people are eating organically grown fruits and vegetables.

TLS Online TPP Program

#Question id: 10506

#Unit 6. System Physiology – Plant

Plant growth promoting rhizobacteria (PGPRs) such as Pseudomonas aeruginosa, that alleviate plant abiotic or biotic stress in soil by releasing of

TLS Online TPP Program

#Question id: 4976

#Unit 11. Evolution and Behavior

Which of these is the most likely explanation for the existence of dicynodont fossils on modern-day Antarctica?