Q: A lion eats a giraffe and uses the nutrients for cellular respiration. Which of the following equations best represents the overall process of aerobic respiration in the lion’s cells?

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy}}}$$

Question 1

Which of the following best describes the process by which a giraffe obtains its energy and carbon for metabolism?

Accepted Answer

It is a chemotroph and heterotroph, using chemical energy from organic molecules and pre-existing organic carbon.

Question 2

A lion eats a giraffe and uses the nutrients for cellular respiration. Which of the following equations best represents the overall process of aerobic respiration in the lion’s cells?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}}}$$

Question 3

Which of the following statements about the First Law of Thermodynamics is correct?

Accepted Answer

Energy can be converted from one form to another, but cannot be created or destroyed.

Question 4

Why can Earth maintain complex, ordered living systems despite the Second Law of Thermodynamics?

Accepted Answer

The Earth is an open system, constantly receiving new energy from the sun.

Question 5

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP stores energy in its phosphate bonds and releases it to power endergonic reactions.

Question 6

A reaction has a positive $$\Delta G. $$Which of the following is true about this reaction?

Accepted Answer

It is endergonic and requires energy input.

Question 7

Which of the following is NOT a factor that affects enzyme function?

Accepted Answer

Atmospheric pressure

Question 8

How do enzymes speed up chemical reactions?

Accepted Answer

By lowering the activation energy needed to reach the transition state

Question 9

In competitive inhibition, what happens to $$K_m$$ and $$V_{max} at $$high substrate concentration?

Accepted Answer

$$K_m$$ increases, but $$V_{max}$$ stays the same

Question 10

Which of the following best describes the difference between a cofactor and a coenzyme?

Accepted Answer

Cofactors are inorganic (minerals/metals); coenzymes are organic (often vitamin-derived)

Question 11

A person develops scurvy due to a deficiency in which vitamin, and what is a key symptom?

Accepted Answer

Vitamin C; loss of teeth

Question 12

Which of the following is an example of feedback inhibition?

Accepted Answer

The end product of a series of reactions inhibits an earlier step in that same reaction chain

Question 13

Which of the following best describes a chemolithotroph?

Accepted Answer

An organism that uses inorganic molecules as an electron source

Question 14

Which of the following reactions is exergonic?

Accepted Answer

ATP $$\rightarrow$$ ADP + Pi

Question 15

A cell uses the energy released from glucose breakdown to synthesize proteins. This is an example of:

Accepted Answer

Energy coupling

Question 16

Which of the following statements about aerobic and anaerobic environments is correct?

Accepted Answer

Oxic environments contain oxygen; anoxic environments lack oxygen.

Question 17

Which of the following best describes the Michaelis constant ($$K_m) in $$enzyme kinetics?

Accepted Answer

$$K_m is $$the substrate concentration at which the reaction rate is half of $$V_{max}.$$

Question 18

Which of the following is a real-world example of an anabolic reaction?

Accepted Answer

Synthesis of proteins from amino acids

Question 19

Which of the following best describes allosteric regulation?

Accepted Answer

A molecule binds to a site other than the active site, changing enzyme activity

Question 20

Which of the following best explains why cells are not in equilibrium?

Accepted Answer

Cells constantly exchange materials and energy with their environment, maintaining a steady state.

Chapter 8: An Introduction to Metabolism – Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드