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

Question 1

Which of the following correctly lists the major levels of biological organization from smallest to largest?

Accepted Answer

Atom, molecule, cell, tissue, organ, organism, population, community, ecosystem, biosphere

Question 2

Which statement best describes the difference between a hypothesis and a theory in biology?

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a well-supported explanation based on a body of evidence.

Question 3

Which of the following is NOT a domain in biological classification?

Accepted Answer

Protista

Question 4

In a controlled experiment, which variable is manipulated by the researcher?

Accepted Answer

Independent variable

Question 5

Which of the following is an example of a buffer system in biology?

Accepted Answer

HCO3- / H2CO3 in blood

Question 6

How many covalent bonds can a carbon atom typically form?

Accepted Answer

$$4$$

Question 7

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

Accepted Answer

Surface tension

Question 8

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

Joining two monomers together by removing a water molecule

Question 9

Which functional group is found in all amino acids?

Accepted Answer

Carboxyl group

Question 10

Which of the following is a difference between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids have one or more double bonds, saturated do not.

Question 11

Which of the following is a major function of proteins in cells?

Accepted Answer

Catalyzing biochemical reactions

Question 12

Which of the following is a purine found in DNA?

Accepted Answer

Adenine

Question 13

Which organelle is responsible for protein synthesis in eukaryotic cells?

Accepted Answer

Ribosome

Question 14

What is the main structural difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, prokaryotic cells do not.

Question 15

Which cellular structure is primarily responsible for maintaining cell shape and enabling movement?

Accepted Answer

Cytoskeleton

Question 16

Which of the following best describes the role of the extracellular matrix in animal cells?

Accepted Answer

It provides structural support and regulates cell behavior.

Question 17

Which type of microscope would you use to view the surface details of a cell at very high magnification?

Accepted Answer

Scanning electron microscope (SEM)

Question 18

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

Accepted Answer

They maintain a stable pH, preventing harmful changes in acidity.

Question 19

If a solution has a pH of 4, what is its hydrogen ion concentration ($$[H^+]$$)? Use the formula $$pH = -\log_{10}[H^+].$$

Accepted Answer

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

Question 20

Which of the following is a correct statement about phospholipids in cell membranes?

Accepted Answer

They form a bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward.

General Biology Study Guide: Foundations, Chemistry of Life, and Cell Structure

Study Guide - Practice Questions