1. which of the following statements about proteins is incorrect?

(a) all proteins are made up of some combination of 20 essential amino acids.
(b) like nucleic acids, polypeptides have polarity.
(c) a single polypeptide has primary, secondary and tertiary structures.
(d) α-helix and β-pleated sheets do not require specific sequence of amino acids to form.
(e) some proteins contain more than one polypeptide chain.

The friction red blood cells encounter when moving past each other. cardiac output: the amount of friction blood encounters during flow through blood vessels. blood pressure: the force of the blood against the vessel wall. blood viscosity: the volume of blood pumped out by one ventricle each minute.

Agene with the original sequence of atgtt—tact underwent substitution mutation to form atatt—tact after a few generations. tact is a part of a muscle protein encoding region, and atgtt codes for a digestive enzyme. what will be the effect of this mutation? a. the production of muscle protein will be affected. b. the production of digestive enzymes will be affected. c. the production of both the protein and the enzyme will be affected. d. the production of neither the protein nor the enzyme will be affected.

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an