Question 1

Which of the following statements best describes the difference between a structural isomer and a geometric isomer of glucose?

Accepted Answer

Structural isomers differ in the placement of covalent bonds, while geometric isomers have the same covalent bonds but differ in the spatial arrangement of atoms around a carbon skeleton.

Question 2

A patient is diagnosed with a genetic disorder that affects the formation of peptide bonds. Which macromolecule's synthesis is most directly impaired?

Accepted Answer

Proteins

Question 3

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

Their amphipathic nature, with hydrophilic heads and hydrophobic tails, allows them to form bilayers in aqueous environments.

Question 4

A DNA sample contains 30% adenine. According to Chargaff's rules, what percentage of guanine is present in the sample?

Accepted Answer

$$20\%$$

Question 5

Which of the following is a correct description of a dehydration (condensation) reaction?

Accepted Answer

It forms covalent bonds between monomers by removing a molecule of water.

Question 6

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP acts as the energy currency of the cell, providing energy for biochemical reactions.

Question 7

A scientist discovers a new organism with cell walls composed of chitin. Based on this information, to which group could this organism most likely belong?

Accepted Answer

Fungi

Question 8

Which of the following statements about amino acids is correct?

Accepted Answer

Amino acids are linked by peptide bonds to form proteins.

Question 9

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

Accepted Answer

Unsaturated fatty acids have double bonds that create kinks, preventing tight packing.

Question 10

A mutation causes a protein to lose its tertiary structure but retain its primary and secondary structures. Which of the following is most likely to be affected?

Accepted Answer

The overall three-dimensional shape and function of the protein

Question 11

Which of the following best describes the relationship between nucleotides and nucleic acids?

Accepted Answer

Nucleotides are the monomers that make up nucleic acids such as DNA and RNA.

Question 12

Which of the following is a function of proteins in the cell membrane?

Accepted Answer

Forming channels for transport of molecules across the membrane

Question 13

A food contains mostly cellulose. Which statement best explains why humans cannot digest this food efficiently?

Accepted Answer

Humans lack the enzymes to break the $$\beta(1 \rightarrow 4)$$ glycosidic bonds in cellulose.

Question 14

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 15

Which of the following best explains why chaperone proteins are important in cells?

Accepted Answer

They assist in the correct folding of proteins into their tertiary structure.

Question 16

A researcher is studying a molecule with the formula $$C_6H_{12}O_6$. Which of the following could this molecule be?

Accepted Answer

A monosaccharide such as glucose or fructose

Question 17

Which of the following best describes the role of NAD$$^+$$ and FAD in cellular metabolism?

Accepted Answer

They act as electron carriers in redox reactions.

Question 18

A diet consisting only of cereal grains may lead to protein deficiency. Which of the following best explains why?

Accepted Answer

Cereal grains are low in lysine, an essential amino acid.

Question 19

Which of the following best explains why breaking a C-H bond in a lipid releases energy?

Accepted Answer

C-H bonds are nonpolar and store a large amount of chemical energy.

Question 20

A mutation in a gene changes a single amino acid in a protein. Which level(s) of protein structure could be affected by this change?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Introduction to Cytology and Biological Macromolecules

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