Question 1

Which of the following best describes the role of water's polarity in supporting life on Earth?

Accepted Answer

It allows water molecules to form hydrogen bonds, leading to high cohesion and surface tension.

Question 2

A scientist is studying a molecule with the formula $$C_6H_{12}O_6$. Which type of bond is most likely to be found between the carbon and hydrogen atoms in this molecule?

Accepted Answer

Nonpolar covalent bond

Question 3

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of a reaction, increasing the reaction rate.

Question 4

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain in aerobic organisms?

Accepted Answer

Oxygen ($$O_2)$$

Question 5

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

Accepted Answer

$$1 	imes 10$$^{-4}$$ M

Question 6

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

Accepted Answer

Hydrogen bonds in ice create a lattice structure that is less dense than liquid water.

Question 7

Which process in cellular respiration produces the most ATP per molecule of glucose?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 8

A plant is exposed to light that is primarily green in wavelength. What is the most likely effect on the rate of photosynthesis, and why?

Accepted Answer

The rate of photosynthesis will decrease because chlorophyll reflects green light.

Question 9

Which of the following reactions is endergonic?

Accepted Answer

Synthesis of glucose during photosynthesis

Question 10

A mutation causes ATP synthase to become nonfunctional in a eukaryotic cell. Which process will be directly affected?

Accepted Answer

Production of ATP via chemiosmosis in the mitochondria

Question 11

Which of the following best describes the difference between C3 and C4 photosynthesis?

Accepted Answer

C4 plants spatially separate carbon fixation and the Calvin cycle to reduce photorespiration.

Question 12

Which of the following statements about redox reactions in cellular respiration is correct?

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 13

A molecule has an atomic number of 8 and an atomic mass of 16. How many neutrons does it have?

Accepted Answer

8

Question 14

Which of the following is a property of hydrophobic molecules?

Accepted Answer

They do not dissolve easily in water.

Question 15

If a reaction has a negative $$\Delta G$$, which of the following is true?

Accepted Answer

The reaction is exergonic and can occur spontaneously.

Question 16

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP hydrolysis releases energy that can be used to drive endergonic reactions.

Question 17

During the Calvin cycle, which molecule is directly used to fix carbon dioxide?

Accepted Answer

Ribulose-1,5-bisphosphate (RuBP)

Question 18

Which of the following scenarios best illustrates the first law of thermodynamics in a biological system?

Accepted Answer

Energy from sunlight is converted into chemical energy during photosynthesis.

Question 19

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis → Pyruvate processing → Citric acid cycle → Electron transport chain

Question 20

A patient is diagnosed with lactic acidosis after intense exercise. Which metabolic pathway is primarily responsible for the accumulation of lactic acid?

Accepted Answer

Fermentation

General Biology: Molecular Origin, Chemical Basis, Energy, Cellular Respiration, and Photosynthesis

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