Question 1

Which of the following best describes an atom?

Accepted Answer

The smallest unit of an element, consisting of a nucleus surrounded by electrons.

Question 2

Given that the atomic mass of hydrogen is 1.008 and its atomic number is 1, how many neutrons does the most common isotope of hydrogen have?

Accepted Answer

0

Question 3

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

Accepted Answer

It has a bent shape and unequal sharing of electrons between hydrogen and oxygen.

Question 4

Which of the following is a correct statement about covalent bonds?

Accepted Answer

Covalent bonds involve the sharing of electron pairs between atoms.

Question 5

A solution contains $\mathrm{NaCl}$ dissolved in water. Which of the following best describes the interaction between $\mathrm{Na^+}$ ions and water molecules?

Accepted Answer

The partially negative oxygen atom of water is attracted to $\mathrm{Na^+}$ ions.

Question 6

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds occur between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom.

Question 7

Which of the following best describes an amphipathic molecule?

Accepted Answer

A molecule that contains both hydrophilic and hydrophobic regions.

Question 8

Which of the following is an example of a decomposition reaction?

Accepted Answer

$\mathrm{2H_2O_2 \rightarrow 2H_2O + O_2}$

Question 9

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction.

Question 10

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 11

Which of the following is a function of carbohydrates in cells?

Accepted Answer

Providing structural support and serving as an energy source.

Question 12

Which of the following best explains why saturated fats are solid at room temperature?

Accepted Answer

They have straight hydrocarbon chains that pack closely together.

Question 13

Which of the following is true about DNA and RNA?

Accepted Answer

DNA contains thymine, while RNA contains uracil.

Question 14

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

Accepted Answer

The overall three-dimensional shape of a single polypeptide chain.

Question 15

Which of the following statements about lipids is correct?

Accepted Answer

Lipids are important for energy storage and membrane structure.

Question 16

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

Accepted Answer

The association of two or more polypeptide chains.

Question 17

Which of the following is a correct statement about nucleic acids?

Accepted Answer

Nucleic acids store and transmit genetic information.

Question 18

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

Enzymes have active sites with unique shapes that fit only specific substrates.

Question 19

Which of the following is a correct description of a chemical reaction?

Accepted Answer

A process in which atoms are rearranged to form new substances.

Question 20

Which of the following best describes the role of activation energy in a chemical reaction?

Accepted Answer

It is the minimum energy required to start a chemical reaction.

From Atoms to Macromolecules: Biochemistry Basics for Microbiology

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