Q: Given the DNA sequence 5'-ATG CCG TAA-3', what is the sequence of the complementary DNA strand?

$$3'\text{-}TAC\;GGC\;ATT\;5'$$

Question 1

Which of the following best describes the difference between an aldose and a ketose monosaccharide?

Accepted Answer

An aldose contains a carbonyl group at the end of the carbon chain, while a ketose contains a carbonyl group within the carbon chain.

Question 2

Which of the following statements about D- and L- enantiomers of monosaccharides is correct?

Accepted Answer

Only D-enantiomers are commonly found in nature.

Question 3

Which of the following disaccharides is a nonreducing sugar?

Accepted Answer

Sucrose

Question 4

Which of the following polysaccharides is NOT digestible by humans and why?

Accepted Answer

Cellulose, because it contains $$\beta-1$$,4-glycosidic bonds that humans lack enzymes to hydrolyze.

Question 5

A fatty acid with the formula $$\mathrm{C$$_{18}$$H_{34}O_2$} is $$most likely:

Accepted Answer

A monounsaturated fatty acid

Question 6

Which of the following statements about the chemical properties of triacylglycerols is correct?

Accepted Answer

Hydrogenation converts unsaturated fatty acids to saturated fatty acids by adding hydrogen across double bonds.

Question 7

Which of the following best describes the difference between fats and oils?

Accepted Answer

Fats are solid at room temperature due to a higher proportion of saturated fatty acids, while oils are liquid due to more unsaturated fatty acids.

Question 8

Which of the following is true regarding the secondary structure of proteins?

Accepted Answer

It is stabilized primarily by hydrogen bonds between backbone atoms.

Question 9

A peptide has the sequence Gly-Ala-Ser. Which end is the N-terminus?

Accepted Answer

The glycine end

Question 10

Which of the following statements about protein denaturation is correct?

Accepted Answer

Denaturation disrupts secondary, tertiary, and quaternary structures but leaves the primary structure intact.

Question 11

Which of the following is a component of both DNA and RNA?

Accepted Answer

Phosphoric acid

Question 12

Given the DNA sequence 5'-ATG CCG TAA-3', what is the sequence of the complementary DNA strand?

Accepted Answer

$$3'	ext{-}TAC\;GGC\;ATT\;5'$$

Question 13

Which of the following best describes a nucleotide?

Accepted Answer

A nucleotide consists of a nitrogenous base, a pentose sugar, and a phosphate group.

Question 14

Which of the following mutations is most likely to result in a nonfunctional protein?

Accepted Answer

A frameshift mutation

Question 15

Which of the following best describes the difference between a nucleoside and a nucleotide?

Accepted Answer

A nucleoside lacks a phosphate group, while a nucleotide contains one or more phosphate groups.

Question 16

Which of the following statements about cholesterol is correct?

Accepted Answer

Cholesterol contains a hydroxyl group and four fused hydrocarbon rings.

Question 17

Which of the following best describes the process of saponification?

Accepted Answer

The hydrolysis of a triacylglycerol with a strong base to produce glycerol and soap (salts of fatty acids).

Question 18

Which of the following is a correct pairing of a polysaccharide and its glycosidic bond type?

Accepted Answer

Amylose: $$\alpha-1$$,4-glycosidic bonds

Question 19

Which of the following best describes the role of hydrogen bonds in the structure of DNA?

Accepted Answer

Hydrogen bonds hold the two complementary strands of DNA together between the nitrogenous bases.

Question 20

Which of the following best describes the difference between the tertiary and quaternary structure of proteins?

Accepted Answer

Tertiary structure is the three-dimensional shape of a single polypeptide chain, while quaternary structure involves the arrangement of multiple polypeptide chains.

Comprehensive Study Notes: Carbohydrates, Lipids, Proteins, and Nucleic Acids

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