Q: If the pH of a solution is 4, what is the concentration of hydrogen ions $$[H^+] in $$the solution?

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

Question 1

Which of the following best describes a property of water that results directly from hydrogen bonding?

Accepted Answer

Water exhibits cohesion, allowing it to form droplets.

Question 2

A scientist is studying the effect of temperature on enzyme activity in a cell. Which level of biological organization is MOST directly involved in this study?

Accepted Answer

Cell

Question 3

Which of the following is an example of negative feedback regulation in biological systems?

Accepted Answer

Release of insulin to lower blood glucose levels

Question 4

Given an atom with atomic number 8 and mass number 18, how many neutrons does it have?

Accepted Answer

$$18 - 8 = 10$$ neutrons

Question 5

Which of the following statements about covalent bonds is TRUE?

Accepted Answer

Covalent bonds involve the sharing of electron pairs between atoms.

Question 6

A radioactive isotope has a half-life of 5,000 years. If a fossil contains 25% of its original radioactive isotope, how old is the fossil?

Accepted Answer

$$10,000$$ years

Question 7

Which of the following best explains why water has a high surface tension?

Accepted Answer

Hydrogen bonds between water molecules create strong cohesive forces.

Question 8

If the pH of a solution is 4, what is the concentration of hydrogen ions $$[H^+] in $$the solution?

Accepted Answer

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

Question 9

Which chemical group is found in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group

Question 10

Which type of isomer differs in the spatial arrangement of atoms around a double bond?

Accepted Answer

Geometric (cis-trans) isomer

Question 11

How many water molecules are needed to hydrolyze a polymer that is 5 monomers long?

Accepted Answer

4

Question 12

Which type of bond is responsible for the secondary structure of proteins (such as alpha helices and beta sheets)?

Accepted Answer

Hydrogen bonds

Question 13

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

Accepted Answer

Unsaturated fats contain one or more double bonds in their fatty acid chains.

Question 14

Which organelle is responsible for producing ATP in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 15

Which of the following is found in prokaryotic cells but NOT in eukaryotic cells?

Accepted Answer

Circular DNA

Question 16

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

Accepted Answer

A hypothesis is a testable statement, while a theory is a comprehensive explanation supported by evidence.

Question 17

Which of the following domains includes organisms with membrane-bound nuclei?

Accepted Answer

Eukarya

Question 18

A solution is prepared by dissolving 18 g of glucose ($$C_6H_{12}O_6$) in enough water to make 1 L of solution. What is the molarity of the solution? (Molar mass of glucose = 180$$ 	ext{ g/mol}$$)

Accepted Answer

$$0.1 	ext{ M}$$

Question 19

Which of the following best describes the difference between reductionist and systems biology approaches?

Accepted Answer

Reductionist biology breaks down complex systems into simpler parts, while systems biology studies the interactions among those parts.

Question 20

Which of the following is a functional group that can act as a base by accepting $$H^+$$ ions?

Accepted Answer

Amino group

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