Question 1

Which of the following best explains why water molecules are able to form hydrogen bonds with each other?

Accepted Answer

Water molecules are polar, with the oxygen atom carrying a partial negative charge and the hydrogen atoms carrying partial positive charges, enabling hydrogen bonding.

Question 2

Which of the following statements correctly differentiates between saturated and unsaturated fats?

Accepted Answer

Saturated fats have only single bonds between carbon atoms, making them solid at room temperature, while unsaturated fats have one or more double bonds, making them liquid.

Question 3

Given an atom with 11 protons, 12 neutrons, and 11 electrons, what is its atomic number and atomic mass?

Accepted Answer

Atomic number: 11, Atomic mass: 23

Question 4

Which of the following best describes the 'central dogma' of molecular biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 5

Which of the following is a correct example of complementary base pairing in DNA?

Accepted Answer

A pairs with T, C pairs with G

Question 6

A solution has a pH of 4. What is the concentration of hydrogen ions $[H^+]$ in the solution?

Accepted Answer

$[H^+] = 1 	imes 10^{-4}$ M

Question 7

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that releases energy and has a negative $\Delta G$.

Question 8

Which of the following is NOT a function of phospholipids in living cells?

Accepted Answer

Acting as enzymes to catalyze metabolic reactions

Question 9

If a DNA sequence is 5'-ATCGGTA-3', what would be the complementary RNA sequence produced during transcription?

Accepted Answer

5'-UAGCCAU-3'

Question 10

Which of the following best explains how enzymes catalyze reactions?

Accepted Answer

Enzymes lower the activation energy, allowing reactions to proceed more quickly.

Question 11

Which of the following is true about facilitated diffusion?

Accepted Answer

It uses membrane proteins to move molecules down their concentration gradient without energy input.

Question 12

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

Accepted Answer

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

Question 13

A patient is diagnosed with anemia due to a mutation in the gene coding for hemoglobin. Which level of protein structure is most directly affected by this mutation?

Accepted Answer

Primary structure

Question 14

Which of the following is a correct prediction for the RNA sequence transcribed from a DNA template strand with the sequence 3'-TACGGT-5'?

Accepted Answer

5'-AUGCCA-3'

Question 15

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have different numbers of neutrons.

Question 16

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 17

Which of the following is a correct description of active transport?

Accepted Answer

Movement of molecules against their concentration gradient using energy, often in the form of ATP.

Question 18

Which of the following is a correct structural feature of RNA?

Accepted Answer

RNA contains the base uracil instead of thymine.

Question 19

Which of the following best describes the role of allosteric regulation in enzyme activity?

Accepted Answer

Allosteric regulation involves the binding of a molecule at a site other than the active site, changing the enzyme's shape and activity.

General Biology I: Study Guide and Key Concepts

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