Chapter 4. 4·1–4·4 Energy flows from the sun and through all life on earth.

Show What You Know - Self Quiz

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You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 4·1–4·4 Energy flows from the sun and through all life on earth by answering the following questions.

1.

1. Every time a source of energy is converted from one form to another:

the second law of thermodynamics is violated.

some of the energy is converted to heat, which is not a very usable form of kinetic energy.

the total amount of energy in the universe is reduced by a tiny amount.

heat is required.

the potential energy of the system increases.

Correct! (See section 4·3 As energy is captured and converted, the amount of energy available to do work decreases.)

Incorrect. (See section 4·3 As energy is captured and converted, the amount of energy available to do work decreases.)

2.

2. A cyclist rides her bike up a very steep hill. Of the following choices, which statement properly describes this example in energetic terms?

Potential energy in food is converted to kinetic energy as the cyclist's muscles push her up the hill.

Kinetic energy is highest when the cyclist is at the crest of the hill.

The cyclist produces the most potential energy as she cruises down the hill's steep slope.

Potential energy is greatest when the cyclist is at the top of the hill.

Both A and D are correct.

Correct! (See section 4·2 Energy has two forms: kinetic and potential.)

Incorrect. (See section 4·2 Energy has two forms: kinetic and potential.)

3.

3. When ATP is hydrolyzed to ADP, what happens?

One phosphate is removed.

Three phosphates are removed.

Two phosphates are removed.

Ribose is removed.

Adenine is removed.

Correct! (See section 4·4 ATP molecules are like free-floating rechargeable batteries in all living cells.)

Incorrect. (See section 4·4 ATP molecules are like free-floating rechargeable batteries in all living cells.)

4.

4. The first law of thermodynamics states that energy is constant; it can ___________, but not ___________.

be increased and decreased; eliminated

be transferred and transformed; created or destroyed

rise and fall; enter and exit ecosystems

cycle; flow

be produced and generated; moved or relocated

Correct! (See section 4·3 As energy is captured and converted, the amount of energy available to do work decreases.)

Incorrect. (See section 4·3 As energy is captured and converted, the amount of energy available to do work decreases.)

5.

5. How many phosphates do ADP & ATP each have?

1, 3

1, 2

0, 3

0, 1

2, 3

Correct! (See section 4·4 ATP molecules are like free-floating rechargeable batteries in all living cells.)

Incorrect. (See section 4·4 ATP molecules are like free-floating rechargeable batteries in all living cells.)

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