Which one of the following photoreceptors is under circadian control and regulates the expression of clock-regulated genes?

#Question id: 150

#Unit 1. Molecules and their Interaction Relevant to Biology

How do the pKa values of an ionizable side chain compare when the amino acid is free versus when it is in a polypeptide chain?

#Question id: 3690

#Unit 3. Fundamental Processes

The DNA polymerase is a template-directed enzyme that synthesizes new complementary strand from a parent strand but it requires the existing short nucleotide sequence for its elongation. Which of the following enzyme is required for the synthesis of this primer?

#Question id: 11552

#Unit 7. System Physiology – Animal

Which of the following are properties of steroid hormones?

I) Steroid hormones are lipid soluble and easily cross the phospholipid bilayer.

II) Steroid hormones usually exert their effects on target cells through membrane receptor proteins.

III) Steroid hormones act on cells close to where they were produced.

IV) Steroid hormones regulate gene transcription by binding to intracellular receptor proteins.

#Question id: 29081

#Unit 10. Ecological Principles

#Question id: 20711

#Unit 12. Applied Biology