Practice Questions

TLS Online TPP Program

#Question id: 3830

Why is DNA damage in skin cells from exposure to excessive UV light not completely reversed by photoreactivation?

#Unit 3. Fundamental Processes

DNA photolyase in humans is activated only under conditions of heat shock.
Humans lack a photoreactivation repair mechanism.
The presence of histones greatly slows photoreactivation, thus humans depend primarily on other forms of DNA repair.
Photoreactivation is specific for the removal of thymine dimers. Thymine dimers do not form in human DNA.

More Questions

TLS Online TPP Program

#Question id: 536

#Unit 1. Molecules and their Interaction Relevant to Biology

Glucose 6-phosphate allosterically inhibits

A) hexokinase I.

B) glucokinase.

C) hexokinase II.

TLS Online TPP Program

#Question id: 23574

#Unit 8. Inheritance Biology

Which of the following are played an important role in the evolution of human chromosomes?

TLS Online TPP Program

#Question id: 612

#Unit 1. Molecules and their Interaction Relevant to Biology

The quaternary structure of hemoglobin changes from the T state to the R state ________.

TLS Online TPP Program

#Question id: 15608

#Unit 12. Applied Biology

Melanins are light-absorbing biopolymers useful as topical sunscreens, sunlight-protective coatings for plastics, etc. Which gene is used for producing melanin.

TLS Online TPP Program

#Question id: 11708

#Unit 7. System Physiology – Animal

Use the following clinical laboratory test results:

Urine flow rate = 1 ml/min

Urine inulin concentration = 100 mg/ml

Plasma inulin concentration = 2 mg/ml

Urine urea concentration = 50 mg/ml

Plasma urea concentration = 2.5 mg/ml

What is the glomerular filtration rate (GFR)?