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

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

Question 1

Which of the following best describes the role of a control group in a scientific experiment?

Accepted Answer

It is the group that does not receive the experimental treatment, serving as a baseline for comparison.

Question 2

A scientist is testing the effect of a new fertilizer on plant growth. She gives one group of plants the new fertilizer and another group no fertilizer. She measures the height of the plants after four weeks. In this experiment, what is the dependent variable?

Accepted Answer

The height of the plants after four weeks

Question 3

Which of the following statements about water is FALSE?

Accepted Answer

Water is a nonpolar molecule, so it does not dissolve salts or sugars.

Question 4

Which of the following best explains why oil and water do not mix?

Accepted Answer

Oil is nonpolar and hydrophobic, while water is polar and hydrophilic.

Question 5

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

Accepted Answer

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

Question 6

Which of the following is a correct match between a macromolecule and its monomer?

Accepted Answer

Nucleic acid — Nucleotide

Question 7

Which property of water allows insects to walk on its surface?

Accepted Answer

Cohesion due to hydrogen bonding

Question 8

A molecule of glucose ($$C_6H_{12}O_6$) is classified as which type of macromolecule?

Accepted Answer

Carbohydrate

Question 9

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction that links monomers together by removing a molecule of water

Question 10

Which of the following statements about acids and bases is TRUE?

Accepted Answer

A solution with pH 9 is basic because it has more $$[OH^-]$$ than $$[H^+].$$

Question 11

Which of the following is a function of proteins in living organisms?

Accepted Answer

Catalyzing chemical reactions as enzymes

Question 12

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

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a well-substantiated explanation supported by evidence.

Question 13

Which of the following elements is the most electronegative and commonly found in biological molecules?

Accepted Answer

Oxygen (O)

Question 14

A student is reading a scientific article that summarizes and interprets the results of several primary research studies. What type of source is this article?

Accepted Answer

Secondary source

Question 15

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond where electrons are shared unequally, creating partial charges

Question 16

Which of the following is an example of a micronutrient and its primary function?

Accepted Answer

Vitamin C — functions as an antioxidant

Question 17

Which of the following best explains why water is considered a good solvent for many biological molecules?

Accepted Answer

Water is polar and can form hydrogen bonds with other polar or charged molecules.

Question 18

A researcher finds that as the amount of time spent studying increases, exam scores also increase. This is an example of which type of evidence?

Accepted Answer

Correlational evidence

Question 19

Which of the following is a correct statement about the pH scale?

Accepted Answer

A solution with pH 7 is neutral.

Question 20

Which of the following best describes the function of lipids in living organisms?

Accepted Answer

Long-term energy storage, insulation, and forming cell membranes

General Biology 1003 Study Guide: Scientific Method, Chemistry of Life, and Nutrients

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드