Question

QUESTION 16

What is the function of tRNA molecules?

The A-P-E sites of the ribosome are made out of tRNA molecules

tRNAs transfer the ribosome onto the 5' cap of an mRNA molecule

tRNAs catalyze the formation of new peptide bonds

tRNAs form covalent bonds between the ribosome and the mRNA

tRNAs bring amino acids to specific codons

QUESTION 17

What's the difference between primary and secondary active transport?

Only primary active transport requires energy

Only in primary active transport does a solute move against its concentration gradient

Primary active transport can only move a single ion, while secondary transport moves two ions simultaneously

Primary transport is used for larger solutes, while secondary transport is used for smaller molecules

Primary transport uses ATP-powered pumps, while secondary transport uses energy indirectly

QUESTION 18

When do beta cells release insulin into your bloodstream?

		When you are very hungry
		When blood sugar levels are high
		When high levels of glycogen initiate the relase of insulin-containing vesicles
		When a G-coupled receptor on the beta cells binds to insulin
		When adrenaline binds to a beta cell receptor tyrosine kinase