Introduction To Life Science

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Question 1

During the Calvin-Benson cycle (carbon-fixing reactions), in the red Columbine plant, high-energy electrons are transferred into a newly made 3-carbon compound. Eventually, these electrons will end up as part of glucose molecules. What was the original source of these electrons in photosynthesis?

  A. glucose
  B. carbon dioxide.
  C. oxygen
  D. ATP
  E. water

5 points

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Question 2

A stone is pushed from the top of a hill. Halfway to the bottom of the hill, this rolling stone

  A. is constantly gaining more energy.
  B. has both potential energy and kinetic energy.
  C. is using up chemical energy.
  D. has potential energy only.
  E. has kinetic energy only.

5 points

Question 3

The role of oxygen in cellular respiration is to

  A. act as the final electron acceptor.
  B. supply an energy molecule.
  C. aid in the transport of pyruvate into the mitochondria.
  D. allow glycolysis to continue.
  E. combine with carbon atoms to form carbon dioxide.

5 points

Question 4

Surface tension of water is due to

  A. ionic bonding.
  B. water molecules repelling each other.
  C. the ability of water to act as a solvent.
  D. hydrogen bonding.
  E. ionization of water.

5 points

Question 5

With few exceptions, organic compounds are those that contain

  A. nitrogen.
  B. carbon.
  C. hydrogen.
  D. ocygen.
  E. all of the above.

5 points

Question 6

Most cells are small. When they reach a certain size, cells typically divide. This has to do with the

  A. fact that they cannot possess sufficient numbers of organelles for normal cell functioning.
  B. differences between viral particles and eukaryotic cells.
  C. surface-to-volume ratio.
  D. amount of genetic material.
  E. inability to produce more components of the cell membrane.

5 points

Question 7

The majority of ATP produced in cellular respiration is produced during

  A. the Krebs cycle.
  B. glycolysis.
  C. the electron transport chain.
  D. anaerobic processes.
  E. fermentation.

5 points

Question 8

In a cell,

  A. energy-releasing reactions are coupled to energy-absorbing reactions.
  B. energy-absorbing reactions and energy-releasing reactions are unlinked.
  C. energy-absorbing reactions are coupled to energy-releasing reactions via electron carriers.
  D. there are many more energy-absorbing reactions than energy-releasing reactions.
  E. more energy is used up than is produced.

5 points

Question 9

What method is often used by cells to move large solid material into the cell?

  A. facilitated diffusion.
  B. phagocytosis.
  C. simple diffusion.
  D. exocytosis.
  E. active transport.

5 points

Question 10

Rank the following chemical bonds from weakest to strongest:

  A. hydrogen, ionic, covalent
  B. ionic, hydrogen, covalent
  C. hydrogen, covalent, ionic
  D. ionic, covalent, hydrogen
  E. covalent, ionic, hydrogen

5 points

Question 11

Because the shared electrons between hydrogen and oxygen spend more time orbiting the oxygen than the hydrogen, water is

  A. a nonpolar molecule.
  B. a charged molecule.
  C. a polar molecule.
  D. a neutral molecule.

5 points

Question 12

A hummingbird is “drinking” nectar containing sugar from a red columbine flower. Arrange the following events to occur in the hummingbird in order from the first to last:

Glucose sugar is converted to pyruvate.

Energy from high-energy electrons is released from an electron transport chain. This energy is used to make ATP.

The hummingbird exhales carbon dioxide and energy is stored in electron carriers.

The hummingbird has the ability to beat its wings 40 – 80 times a second.

  A. 2, 3, 4, 1
  B. 1, 3, 2, 4
  C. 1, 2, 3, 4
  D. 1, 4, 3, 2
  E. 2, 1, 3, 4

5 points

Question 13

In photosynthesis, the light-dependent reactions

  A. can take place day or night.
  B. produce ADP and carbon dioxide.
  C. produce ATP and energy stored in electron carriers.
  D. are uncoupled from the light-independent reactions.
  E. lead to carbon fixation.

5 points

Question 14

All enzymes act by

  A. allowing products to be changed during the chemical reactions.
  B. raising the activation energy of specific chemical reactions.
  C. breaking hydrogen bonds between molecules.
  D. breaking and forming ionic bonds between ions.
  E. lowering the activation energy of specific chemical reactions.

5 points

Question 15

This element is prominent in both living organisms and in the Earth’s surface.

  A. silicon
  B. oxygen
  C. carbon
  D. aluminum
  E. hydrogen

5 points

Question 16

The atomic nucleus consists of

  A. neutrons and electrons.
  B. neutrons only.
  C. protons only.
  D. neutrons and protons.
  E. protons and electrons

5 points

Question 17

Because of the atomic structure of carbon, it tends to form

  A. bonds only with hydrogen.
  B. ionic bonds.
  C. covalent bonds.
  D. sulfide bonds.
  E. hydrogen bonds.

5 points

Question 18

The most common energy-carrying molecule in the cell is

  A. ATP.
  B. adenine.
  C. DNA.
  D. AMP.
  E. ADP.

5 points

Question 19

The internal pH of most cells is near neutral. This allows

  A. the buffers produced within the body to affect these cells.
  B. enzymes within the cell to act at peak efficiency.
  C. rapid fluctuations between acidic and basic conditions within the cells.
  D. water to break down into H+ and OH-.
  E. enzymes outside of these cells to function.

5 points

Question 20

As one form of energy is converted into another, there is always some energy lost as

  A. light.
  B. heat.
  C. kinetic energy.
  D. chemical energy.
  E. activation energy.

Question 1

 

During the Calvin

–

Benson cycle (carbon

–

fixing reactions), in the red Columbine plant, high

–

energy

electrons are transferred into a newly made 3

–

carbon compound. Eventually, these electrons will end up

as part of glucose molecules. What was the original sou

rce of these electrons in photosynthesis?

 

 

A.

 

glucose

 

 

B.

 

carbon dioxide.

 

 

C.

 

oxygen

 

 

D.

 

ATP

 

 

E.

 

water

 

5 points

 

 

 

Question 2

 

A stone is pushed from the top of a hill. Halfway to the bottom of the hill, this rolling stone

 

 

A.

 

is constantly gaining more energy.

 

 

B.

 

has both potential energy and kinetic energy.

 

 

C.

 

is using up chemical energy.

 

 

D.

 

has potential energy only.

 

 

E.

 

has kin

etic energy only.

 

5 points

 

 

 

Question 3

 

The role of oxygen in cellular respiration is to

 

 

A.

 

act as the final electron acceptor.

 

 

B.

 

supply an energy molecule.

 

 

C.

 

aid in the transport of pyruvate into the mitochondria.

 

 

D.

 

allow glycolysis to continue.

 

 

E.

 

combine with carbon atoms to form carbon dioxide.

 

Question 1

During the Calvin-Benson cycle (carbon-fixing reactions), in the red Columbine plant, high-energy

electrons are transferred into a newly made 3-carbon compound. Eventually, these electrons will end up

as part of glucose molecules. What was the original source of these electrons in photosynthesis?

 

A. glucose

 

B. carbon dioxide.

 

C. oxygen

 

D. ATP

 

E. water

5 points

Question 2

A stone is pushed from the top of a hill. Halfway to the bottom of the hill, this rolling stone

 

A. is constantly gaining more energy.

 

B. has both potential energy and kinetic energy.

 

C. is using up chemical energy.

 

D. has potential energy only.

 

E. has kinetic energy only.

5 points

Question 3

The role of oxygen in cellular respiration is to

 

A. act as the final electron acceptor.

 

B. supply an energy molecule.

 

C. aid in the transport of pyruvate into the mitochondria.

 

D. allow glycolysis to continue.

 

E. combine with carbon atoms to form carbon dioxide.