Question 1

Which of the following best describes the difference between a condensation (dehydration) reaction and a hydrolysis reaction in the formation and breakdown of polymers?

Accepted Answer

Condensation reactions join monomers by removing a water molecule, while hydrolysis reactions break polymers into monomers by adding a water molecule.

Question 2

A biologist is studying two polysaccharides: one is easily digested by humans, and the other is not. The easily digested polysaccharide has $$\alpha-1$$,4 glycosidic linkages, while the indigestible one has $$\beta-1$$,4 linkages. Which polysaccharides are being described?

Accepted Answer

Starch and cellulose, respectively.

Question 3

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids have two fatty acid tails and one phosphate group, making them amphipathic molecules.

Question 4

A patient is diagnosed with a genetic disorder that prevents the formation of peptide bonds. Which macromolecule's synthesis would be directly affected?

Accepted Answer

Proteins

Question 5

Which of the following best explains why saturated fatty acids are solid at room temperature, while unsaturated fatty acids are liquid?

Accepted Answer

Saturated fatty acids have no double bonds, allowing them to pack tightly together.

Question 6

A scientist is analyzing a nucleic acid and finds that it contains ribose sugar and uracil. Which type of nucleic acid is it?

Accepted Answer

RNA

Question 7

Which of the following best describes the backbone of a nucleic acid strand?

Accepted Answer

A repeating pattern of phosphate and sugar groups

Question 8

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA consists of two strands twisted into a double helix, with the sugar-phosphate backbones on the outside and nitrogenous bases paired in the center.

Question 9

A mutation changes the sequence of amino acids in a protein. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 10

Which of the following conditions is most likely to cause a protein to denature?

Accepted Answer

High temperature

Question 11

A researcher uses a light microscope to observe a living cell. Which of the following is a limitation of this technique compared to electron microscopy?

Accepted Answer

Light microscopes have lower resolution and cannot reveal the detailed structure of organelles as electron microscopes can.

Question 12

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

Accepted Answer

A nucleotide consists of a nitrogenous base, a sugar, and a phosphate group, while a nucleoside consists of only a nitrogenous base and a sugar.

Question 13

Which of the following statements about glycogen and starch is correct?

Accepted Answer

Glycogen is a highly branched polysaccharide stored in animals, while starch is the main storage polysaccharide in plants.

Question 14

Which of the following best explains why humans can digest starch but not cellulose?

Accepted Answer

Humans have enzymes that can hydrolyze $$\alpha-1$$,4 glycosidic linkages in starch, but lack enzymes to break $$\beta-1$$,4 linkages in cellulose.

Question 15

A protein is exposed to a solution with a very low pH. What is the most likely effect on the protein's structure?

Accepted Answer

The protein will denature due to disruption of ionic and hydrogen bonds.

Question 16

Which of the following best describes the role of DNA in determining protein structure?

Accepted Answer

DNA provides the exact order of amino acids in a protein, which determines its primary structure.

Question 17

Which of the following is a correct description of a glycosidic linkage?

Accepted Answer

A covalent bond formed between two monosaccharides by a dehydration reaction.

Question 18

A scientist is studying a molecule with the following structure: a phosphate group, a deoxyribose sugar, and a nitrogenous base. Which molecule is this?

Accepted Answer

A nucleotide of DNA

Question 19

Which of the following best explains the importance of the double helix structure of DNA?

Accepted Answer

It allows for complementary base pairing, which is essential for accurate DNA replication.

Question 20

Which of the following statements about protein secondary structure is correct?

Accepted Answer

Secondary structure is stabilized by hydrogen bonds between the backbone atoms of the polypeptide chain.

Macromolecules, Cell Structure, and Microscopy: Study Guide for General Biology

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