Question 1

Which of the following best describes an emergent property in biological systems?

Accepted Answer

A property that arises from the interaction and arrangement of parts within a system, such as consciousness emerging from neural networks.

Question 2

Which of the following statements about DNA is correct?

Accepted Answer

DNA is composed of a double helix structure with a sugar-phosphate backbone and nitrogenous bases paired by hydrogen bonds.

Question 3

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

Accepted Answer

The oxygen atom is more electronegative than the hydrogen atoms, creating a partial negative charge near the oxygen and a partial positive charge near the hydrogens.

Question 4

A scientist is testing the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. Which is the independent variable in this experiment?

Accepted Answer

The application of the fertilizer

Question 5

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

Accepted Answer

A hypothesis is a testable prediction, while a theory is a broad explanation supported by a large body of evidence.

Question 6

Which of the following is NOT a property of water that is critical for life on Earth?

Accepted Answer

Water has a low specific heat, causing rapid temperature changes.

Question 7

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds in ice keep water molecules farther apart, making ice less dense than liquid water.

Question 8

Which of the following statements about the three domains of life is correct?

Accepted Answer

Bacteria and Archaea are both prokaryotic, while Eukarya includes all eukaryotic organisms.

Question 9

Which of the following best describes the role of ATP in cells?

Accepted Answer

ATP stores and transfers energy for cellular processes by releasing a phosphate group.

Question 10

A protein's function is most directly determined by which of the following?

Accepted Answer

The sequence of amino acids in its primary structure

Question 11

Which of the following best explains why cells are typically small in size?

Accepted Answer

A high surface area to volume ratio allows efficient exchange of materials with the environment.

Question 12

Which of the following is a function of the smooth endoplasmic reticulum (ER) in eukaryotic cells?

Accepted Answer

Synthesis of lipids and detoxification of drugs and poisons

Question 13

Which of the following statements about the plasma membrane is correct?

Accepted Answer

It is composed primarily of a phospholipid bilayer with embedded proteins.

Question 14

Which of the following best describes the process of active transport across a cell membrane?

Accepted Answer

Movement of molecules against their concentration gradient using energy, often from ATP.

Question 15

Which of the following is an example of a secondary messenger in cell signaling?

Accepted Answer

Cyclic AMP (cAMP)

Question 16

Which of the following best describes the difference between a polar covalent bond and a nonpolar covalent bond?

Accepted Answer

A polar covalent bond involves unequal sharing of electrons due to differences in electronegativity, while a nonpolar covalent bond involves equal sharing.

Question 17

Which of the following best explains the function of enzymes in biological systems?

Accepted Answer

Enzymes act as catalysts, lowering the activation energy required for chemical reactions.

Question 18

Which of the following statements about the endosymbiosis hypothesis is correct?

Accepted Answer

Mitochondria and chloroplasts originated from free-living prokaryotes that were engulfed by ancestral eukaryotic cells.

Question 19

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}$$ \ \mathrm{M}$$

Question 20

Which of the following best describes the process of dehydration synthesis?

Accepted Answer

A reaction in which two monomers are joined together by removing a molecule of water.

General Biology: Foundations, Chemistry, Cells, and Membranes – Study Guide

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