Question 1

Which of the following best describes the difference between an ion and an atom?

Accepted Answer

An ion has a positive or negative charge due to the loss or gain of electrons, while an atom is electrically neutral.

Question 2

A patient is diagnosed with anemia and prescribed iron supplements. Which atomic property of iron is most relevant for its role in oxygen transport in hemoglobin?

Accepted Answer

Atomic number, because it determines the number of protons and the element's identity.

Question 3

Which of the following statements about covalent and ionic bonds is correct?

Accepted Answer

Ionic bonds form when electrons are transferred from one atom to another, while covalent bonds form when electrons are shared between atoms.

Question 4

Which of the following is a correct example of a chemical reaction showing reactants and products?

Accepted Answer

$$ \mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} $$

Question 5

Which statement best explains why isotopes are important in medicine?

Accepted Answer

Isotopes can be used in diagnostic PET scans and treatments like radioactive therapy because they have different numbers of neutrons, affecting their stability and behavior.

Question 6

Which of the following best describes the role of a catalyst in a biochemical reaction?

Accepted Answer

A catalyst lowers the activation energy required for a reaction, increasing the reaction rate without being consumed.

Question 7

Which of the following is a correct comparison between organic and inorganic compounds?

Accepted Answer

Organic compounds contain carbon and hydrogen, while inorganic compounds may contain carbon but will lack the associated hydrogen.

Question 8

A solution has a pH of 3. Which of the following statements is true regarding acids and bases?

Accepted Answer

The solution is acidic, and adding a base will increase the pH.

Question 9

Which of the following is NOT a function of proteins in biological systems?

Accepted Answer

Storing genetic information

Question 10

Which of the following best describes the primary structure of a protein?

Accepted Answer

The linear sequence of amino acids in a polypeptide chain

Question 11

Which of the following is a correct statement about the formation of peptide bonds?

Accepted Answer

Peptide bonds form between the amino group of one amino acid and the carboxyl group of another, releasing water.

Question 12

Which of the following is a correct example of an endergonic reaction?

Accepted Answer

Photosynthesis, where energy is absorbed to convert $$ \mathrm{CO_2$} $$ and $$ \mathrm{H_2O} $$ into $$ \mathrm{C_6H_{12}O_6$} $$

Question 13

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA contains deoxyribose sugar and is double-stranded, while RNA contains ribose sugar and is single-stranded.

Question 14

Which of the following best describes the role of lipids in cells?

Accepted Answer

Lipids are important for energy storage, membrane structure, and insulation.

Question 15

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds form between polar molecules and are important for stabilizing the structure of proteins and nucleic acids.

Question 16

A scientist is studying the effect of a new enzyme on the rate of a chemical reaction. Which variable should be measured to determine the enzyme's effect?

Accepted Answer

The activation energy required for the reaction

Question 17

Which of the following is a correct statement about the secondary structure of proteins?

Accepted Answer

It involves the folding of the polypeptide chain into alpha helices and beta sheets stabilized by hydrogen bonds.

Question 18

Which of the following best describes the difference between a compound and a molecule?

Accepted Answer

A compound contains at least two different elements, while a molecule can be made of the same or different elements.

Question 19

Which of the following is a correct statement about amphipathic molecules?

Accepted Answer

Amphipathic molecules have both hydrophilic and hydrophobic regions, allowing them to interact with both water and lipids.

From Atoms to Macromolecules: Foundations for Microbiology

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