1) How do the alfa and beta forms of glucose differ? pls help with the answers need them for an exam

A) Their linear structures differ in the location of a hydroxyl group.
B) Their ring structures differ in the location of a hydroxyl group.
C) The oxygen atom inside the ring is located in a different position.
D) The ΅ form can be involved in 1,4 and 1,6 glycosidic linkages; the Ά form can participate only
in 1,4 peptide bonds.

2) Although DNA is the main hereditary material in all life-forms, it lacks one important
characteristic of being a candidate for the first life-form. Why have researchers rejected the idea
that DNA was found in the first life-form?
A) It is not stable enough to have withstood early Earth's harsh atmosphere.
B) The type of sugar found in DNA is much too complicated to have been present early in
Earth's history.
C) Because it has only four different bases, it does not carry enough information; therefore, it
cannot adapt and evolve.
D) It does not function as a catalyst.
3) If you change the number of neutrons in an atom, you create _____. 3)
A) a cation B) an anion
C) an isotope D) a different element
4) Compare proteins to nucleic acids. Which of the following is true?
A) Both take on structural roles in the cell.
B) Monomers of both contain phosphorus.
C) Both have primary and secondary structure.
D) Both contain sulfur.
5) Which reaction is most spontaneous?
A) a reaction that is slightly endothermic and leads to a huge decrease in entropy
B) a reaction that is highly exothermic and leads to a huge decrease in entropy
C) a reaction that is slightly exothermic and leads to a slight increase in entropy
D) a reaction that is slightly exothermic and leads to a huge increase in entropy
6) How many electrons are involved in a single covalent bond?
A) one B) two C) three D) four
7) When polymerization of a protein is complete, but the protein is still completely linear, what is the
highest level of structure that has been completed?