4. Which of the following is an aldehyde? A. CH3CH2CH2CHO B. CH3CH2CH-O-CH3 C. C

ID: 1017294 • Letter: 4

Question

4. Which of the following is an aldehyde?

A. CH3CH2CH2CHO B. CH3CH2CH-O-CH3 C. CH3CH2CH2COH D. CH3CH2CH2CNH2

8. Amino acids are named based on the identity of their ___ ___.

A. carboxyl groups B. ammonium ion C. side chains D. acid residues

9. The products of heating carbohydrates is _______ and a black soot.

A. carbon B. ammonia C. sugar D. water

10. A molecule with a stereocenter is a ________ molecule.

A. symmetric B. chiral C. ionized D. dissociated

12. In forming a peptide bond, a ______ atom of one amino acids bonds to the ______ atom of a second amino acid.

A. hydrogen, oxygen B. carbon, nitrogen C. oxygen, carbon D. nitrogen, hydrogen

14. The beta sheet resulting from hydrogen bonding interactions between peptide groups is described as __________ protein structure.

A. primary B. secondary C. tertiary D. quaternary

15. Which of the following is not a main function of proteins in the human body?

A. make antibodies for our immune system B. transport oxygen through the blood C. stop radioactive decay of C-14 D. store iron in the liver

16. Which organic base is found only in RNA?

A. thymine B. adenine C. uracil D. guanine

18. One important feature of the DNA double helix is that the two strands run _________ to one another.

A. perpendicular B. identical C. parallel D. antiparallel

19. What is the complementary strand of DNA to the following sequence? 5’ A-C-T-C-G-G-T-A-A 3’

A. 3’ A-C-T-C-G-G-T-A-A 5’ B. 5’ A-C-T-C-G-G-T-A-A 3’ C. 3’ T-G-A-G-C-C-A-T-T 5’ D. 5’ T-G-A-G-C-C-A-T-T 3’

20. A ______ is a segment of DNA that carries a single, specific command, for example, “make a globin molecule”.

A. helix B. gene C. nucleotide D. base

(4) (A) CH3CH2CH2CHO IS AN ALDEHYDE

(8) (C) Side chains

(9) (A) Carbon

(10) (B) Chiral molecule

(12) (B) Carbon , Nitrogen

(14) (B) Secondary structure

(16) (C) Uracil

(18) (D) Anti parallel to one another

(20) (D) base

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