Question 1

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

Accepted Answer

A theory is a well-supported explanation of natural phenomena, while a law describes consistent relationships under certain conditions, often expressed mathematically.

Question 2

Which of the following is the correct sequence of biological organization from simplest to most complex?

Accepted Answer

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

Question 3

A scientist observes that a certain plant grows faster when exposed to blue light. She proposes that blue light increases the rate of photosynthesis in this plant. Which step of the scientific method is she performing?

Accepted Answer

Hypothesis formation

Question 4

Which of the following is an example of deductive reasoning?

Accepted Answer

Predicting that if all mammals have hair and a whale is a mammal, then a whale must have hair.

Question 5

Given a carbon atom with atomic number 6 and mass number 13, how many neutrons does it have?

Accepted Answer

$13 - 6 = 7$ neutrons

Question 6

Which of the following statements about water is correct?

Accepted Answer

Water's polarity allows it to form hydrogen bonds, giving it high cohesion and surface tension.

Question 7

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

Accepted Answer

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

Question 8

Which functional group is present in all amino acids and gives them their name?

Accepted Answer

Amino and carboxyl groups

Question 9

Which of the following best describes the difference between saturated and unsaturated fats?

Accepted Answer

Saturated fats contain only single bonds between carbon atoms, while unsaturated fats contain one or more double bonds.

Question 10

Which of the following is a correct pairing of a disaccharide and its monosaccharide components?

Accepted Answer

Maltose: glucose + glucose

Question 11

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

Accepted Answer

DNA is usually double-stranded and stores genetic information, while RNA is usually single-stranded and involved in protein synthesis.

Question 12

Which of the following best explains why phospholipids are important for cell membranes?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, allowing them to form bilayers that separate cell contents from the environment.

Question 13

Which of the following is true about the primary structure of a protein?

Accepted Answer

It is the sequence of amino acids in a polypeptide chain.

Question 14

Which of the following is a property of water that results from hydrogen bonding and is crucial for the transport of water in plants?

Accepted Answer

Cohesion

Question 15

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

Buffers maintain a stable pH by accepting or donating hydrogen ions as needed.

Question 16

Which of the following is a correct statement about the domains of life?

Accepted Answer

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

Question 17

Which of the following is a correct empirical formula for a hexose monosaccharide?

Accepted Answer

$C_6H_{12}O_6$

Question 18

Which macromolecule group is the most functionally diverse in living organisms?

Accepted Answer

Proteins

Question 19

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

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons due to differences in electronegativity, while nonpolar covalent bonds involve equal sharing.

Question 20

Which of the following is a correct description of the process of hydrolysis?

Accepted Answer

Hydrolysis breaks a polymer into monomers by adding a water molecule.

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