Question 1

Which of the following best describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve the sharing of electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another.

Question 2

A neutral atom of carbon has an atomic number of 6. How many electrons are in its outermost shell?

Accepted Answer

4

Question 3

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Water has an uneven distribution of electrons, resulting in a partial negative charge near the oxygen atom and a partial positive charge near the hydrogen atoms.

Question 4

Which of the following is the correct formula for calculating pH?

Accepted Answer

$$pH = -\log_{10}[H^+]$$

Question 5

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-5}$$ M. What is its pH?

Accepted Answer

5

Question 6

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction in which two monomers are joined together by removing a molecule of water.

Question 7

Which macromolecule is correctly paired with its monomer?

Accepted Answer

Proteins – Amino acids

Question 8

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a chemical reaction to occur.

Question 9

A patient is diagnosed with lactose intolerance. Which type of macromolecule is the enzyme lactase, and what is its function?

Accepted Answer

Protein; it catalyzes the hydrolysis of lactose into glucose and galactose.

Question 10

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 11

Which of the following is a correct example of a hydrolysis reaction?

Accepted Answer

Breaking a disaccharide into two monosaccharides by adding water.

Question 12

Which of the following best explains why phospholipids are essential components of cell membranes?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, allowing them to form bilayers that separate the cell from its environment.

Question 13

Which of the following is true about isotopes?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 14

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

Accepted Answer

ATP stores and provides energy for many cellular processes.

Question 15

A scientist is studying a molecule with the formula $$C_6H_{12}O_6$. Which class of macromolecule does this molecule most likely belong to?

Accepted Answer

Carbohydrate

Question 16

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 17

Which of the following statements about nucleic acids is correct?

Accepted Answer

DNA and RNA are polymers made of nucleotide monomers.

Question 18

Which of the following is an example of an exothermic reaction in biological systems?

Accepted Answer

The breakdown of glucose during cellular respiration.

Question 19

A student is asked to identify the functional group present in all amino acids. Which group should they select?

Accepted Answer

Amino group ($$-NH_2$)

Question 20

Which of the following best explains the difference between catabolism and anabolism?

Accepted Answer

Catabolism breaks down molecules to release energy, while anabolism builds complex molecules using energy.

E1 - Ch 2: Fundamentals of Chemistry for Microbiology: Atomic Structure, Chemical Bonds, and Biological Macromolecules

Guida di studio - Domande di pratica

Study guide - Flashcard