Biochemistry Questions

What coenzyme does phosphoglycerate mutase need?

Which step is the committed step in glycolysis?

RNA:A. Can be both single and double strandedB. Contains 2'-OHC. Contains ribose sugarsD. Is less stable than DNAE. All of the above

Which reaction in glycolysis is the second priming step?

Which of the following is considered an essential fatty acid (EFAs)? A. arachidonic acid B. alpha linolenic acid C. palmitic acid D. all of the above

glycerol bonded to two fatty acids and one phosphate group that holds a negative charge

he coloration patterns in Siamese Cats arise from a temperature-sensitive mutation. An enzyme required for the synthesis of dark pigment in the fur is unable to function in areas close to the body where normal physiological temperatures prevail. However, at the tips of the ears, paws, the tip of the tail and other extremities where the temperature is slightly lower, the enzyme works correctly and dark pigment is produced. What is happening with the enzyme at the molecular level that explains this? What kind of interactions might be altered by the mutation?

UTP gets attached to ________ and UDP to _________

Which of the following conditions allow an enzyme to catalyze a chemical reaction that has a positive ∆H (an endothermic reaction).The enzyme can increase T (temperature) in the system to drive a negative ∆GThe products of the reaction have greater disorder than the precursors (+∆S)The precursors of the reaction have greater disorder than the products (-∆S)The enzyme can overcome a negative ∆H and negative ∆G by altering the energy content of the products.The enzyme can bring a positive attitude into the mix

Which two amino acids have a sulfur atom in their side chains?A. Met, Trp B. Lys, Trp C. Cys, Arg D. Asp, Glu E. Cys, Met

5 amino acids means there are ________ possibilities for peptide chain

Amino acid side chains that are ______ residues apart line up on one side of an alpha helix.A. 0.54 B. 0.7 C. 2 D. 3.6 E. 4.5

___ What is glycogen?A. A glucose polymer with only a14 linkages.B. A glucose polymer with only b14 linkagesC. A glucose polymer with only a16 linkagesD. A glucose polymer with both a14 and a16 linkagesE. A glucose polymer with both b14 and b16 linkages

Indicate which levels of protein structure are always held together by covalent bonds, which levels are sometimes held together by covalent bonds, and which are never held together by covalent bonds. (4 pts)Always: Sometimes:Never:

how many turns of DNA around histones

In contrast to how a chemist may catalyze a chemical reaction, enzymes must work under conditions of constant

Humans are composed of approximately 200 different cell types that arise through ______.A. a process of gene assortment during development.B. a process of differential gene expression during development.C. amplification of the same types of cells present in the fertilized egg.D. spontaneous formation from components of the fertilized egg.E. Apple, Motorola, Samsung and Huawei production lines.

Aspirin's mode of action is to interact with enzymes called cyclooxygenases and covalently acetylate the active site serine. What kind of inhibitor is aspirin?A. Competitive B. Noncompetitive C. Reversible D. Irreversible E. Hangover

The distance between two amino acids in the folded structure of a protein is typically measured in what units?nanometermillimeterspicometersmicrometers

Sickle cell anemia is caused by a mutation in the beta globin gene resulting in a glutamic acid to valine substitution at position 6 (Glu6Val) of the hemoglobin beta subunit. Under conditions of low oxygen concentrations in the blood, hemoglobin in the patient's red blood cells assemble together to form long fibers that "sickle" the cells leading to occlusion of capillaries.A. People with sickle cell anemia inherit the mutation from both parents and so the mutation is present in the genome of every cell of the body. Why are only the red blood cells affected by the mutation?B. Based on the chemical properties of the Glu and Val side chains, where are these amino acids normally found in the folded structure of a water soluble protein?C. How then do you think the presence of valine at position 6 contributes to the aggregation of hemoglobin when oxygen levels are low?