Question 1

Which of the following best describes the difference between a hypothesis and a theory in scientific research?

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a comprehensive explanation supported by a large body of evidence.

Question 2

Which of the following is an example of a chemical reaction, and what are the products and reactants in the reaction $$2H_2 + O_2$ \rightarrow 2H_2O$$?

Accepted Answer

Reactants: $$2H_2$$ and $$O_2$$; Products: $$2H_2O$$

Question 3

Which of the following best explains why water is an excellent solvent for many biological molecules?

Accepted Answer

Water molecules form hydrogen bonds with polar molecules, allowing them to dissolve easily.

Question 4

Which of the following is a correct pairing of a monomer and its corresponding polymer?

Accepted Answer

Glucose and starch

Question 5

A scientist wants to test the effect of light intensity on the rate of photosynthesis in plants. Which of the following is the best example of a control in this experiment?

Accepted Answer

Plants kept at a constant light intensity while all other variables are kept the same.

Question 6

Which of the following bonds is responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 7

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

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 8

Which of the following best describes the process of dehydration synthesis in the formation of biological macromolecules?

Accepted Answer

A water molecule is removed to form a bond between two monomers.

Question 9

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 10

Which of the following best explains why carbon is considered the molecular basis of life?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable and complex molecules.

Question 11

A solution has a pH of 4. Which of the following statements is true about this solution?

Accepted Answer

It is acidic and has a high concentration of $$H^+$$ ions.

Question 12

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

Accepted Answer

Covalent bonds involve the sharing of electrons, while ionic bonds involve the transfer of electrons.

Question 13

Which of the following is a correct description of the tertiary structure of a protein?

Accepted Answer

The overall three-dimensional shape of a single polypeptide chain, stabilized by interactions between side chains.

Question 14

Which of the following is a function of nucleic acids in living organisms?

Accepted Answer

Storing and transmitting genetic information

Question 15

Which of the following best explains the importance of valence electrons in chemical bonding?

Accepted Answer

Valence electrons are involved in forming chemical bonds between atoms.

Question 16

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

Accepted Answer

Breaking a peptide bond in a protein by adding a water molecule.

Question 17

Which of the following statements about the four major biological macromolecules is correct?

Accepted Answer

Carbohydrates are made of monosaccharides, proteins are made of amino acids, nucleic acids are made of nucleotides, and lipids are made of fatty acids and glycerol.

Question 18

Which of the following best describes the concept of chemical equilibrium?

Accepted Answer

The rate of the forward reaction equals the rate of the reverse reaction.

Question 19

Which of the following is a correct example of a dimer of carbohydrates?

Accepted Answer

Maltose

Question 20

Which of the following best explains why enzymes are important in biological systems?

Accepted Answer

Enzymes speed up chemical reactions by lowering the activation energy.

General Biology Study Guide: Matter, Energy, Chemistry of Life, and Macromolecules

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