CHEM120 Week 8: Exam 3

CHEM120 Week 8: Exam 3 [Dec-2025]

Select all of the RNA bases that can appear in mRNA. Drag each correct answer to the RNA base(s) box.

Not an answer

RNA base(s)

✅ A, U, C, G

A medical isotope has a half-life of 20 minutes. If you have 400 grams of this freshly prepared isotope, how many grams will remain after 60 minutes?

Answers: A – E

A 100 g

B 3 g

C 50 g

D 200 g

E 20 g

The hydrocarbon with the structural formula CHCH=CH≥ would be considered an:

Answers: A – E

A Amide

B Amine

C Alkyne

D Alkene

E Alkane

Select all of the following that you would expect to be a liquid oil at room temperature

Answers: A – E

A A dipeptide

B A carbohydrate with a glycosidic bond

C A fatty acid containing multiple carbon to carbon double bonds

D A fatty acid classified as unsaturated

E A fatty acid containing hexane

Which form of radiation is able to penetrate most deeply into the human body?

Answers: A – D

A Skin would block all of these types of radiation

B Beta decay

C Gamma ray emission

D Alpha decay

The enzyme OREOase acts on chocolate sandwich cockies to break the cookies apart to get to the creamy center. Occasionally, a vanilla cookie also fits into the OREOas ctive site, but the enzyme cannot act on the vanilla cookie so the reaction halts. Eventually, the vanilla coolde leaves the active site. What is the best description of the vanill cookie in this scenario?

A coenzyme

B cofactor

C denaturing of the protein

D non-competitive inhibitor

E competitive inhibitor……………………………………access all the 35 questions and answers at $35 only