Reference no: EM1389786

In a cell,
A) more energy is used up than is produced.
B) energy-absorbing reactions are coupled to energy-releasing reactions via electron carriers.
C) energy-absorbing reactions and energy-releasing reactions are unlinked.
D) there are many more energy-absorbing reactions than energy-releasing reactions.
E) energy-releasing reactions are coupled to energy-absorbing reactions.
2.
The most common energy-carrying molecule in the cell is
A) adenine.
B) ATP.
C) DNA.
D) AMP.
E) ADP.
3.
This element is prominent in both living organisms and in the Earth's surface.
A) aluminum
B) hydrogen
C) carbon
D) oxygen
E) silicon
4.
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) carbon dioxide.
B) ATP
C) oxygen
D) water
E) glucose
5.
With few exceptions, organic compounds are those that contain
A) nitrogen.
B) carbon.
C) ocygen.
D) hydrogen.
E) all of the above.
6.
Rank the following chemical bonds from weakest to strongest:
A) ionic, hydrogen, covalent
B) hydrogen, ionic, covalent
C) ionic, covalent, hydrogen
D) covalent, ionic, hydrogen
E) hydrogen, covalent, ionic
7.
Because the shared electrons between hydrogen and oxygen spend more time orbiting the oxygen than the hydrogen, water is
A) a neutral molecule.
B) a polar molecule.
C) a charged molecule.
D) a nonpolar molecule.
8.
All enzymes act by
A) breaking hydrogen bonds between molecules.
B) allowing products to be changed during the chemical reactions.
C) raising the activation energy of specific chemical reactions.
D) lowering the activation energy of specific chemical reactions.
E) breaking and forming ionic bonds between ions.
9.
Because of the atomic structure of carbon, it tends to form
A) bonds only with hydrogen.
B) hydrogen bonds.
C) sulfide bonds.
D) covalent bonds.
E) ionic bonds.
10.
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) 1, 3, 2, 4
B) 1, 2, 3, 4
C) 2, 1, 3, 4
D) 1, 4, 3, 2
E) 2, 3, 4, 1
11.
Most cells are small. When they reach a certain size, cells typically divide. This has to do with the
A) surface-to-volume ratio.
B) amount of genetic material.
C) fact that they cannot possess sufficient numbers of organelles for normal cell functioning.
D) differences between viral particles and eukaryotic cells.
E) inability to produce more components of the cell membrane.
12.
The atomic nucleus consists of
A) protons and electrons
B) neutrons and protons.
C) neutrons only.
D) protons only.
E) neutrons and electrons.
13.
A stone is pushed from the top of a hill. Halfway to the bottom of the hill, this rolling stone
A) has both potential energy and kinetic energy.
B) is constantly gaining more energy.
C) is using up chemical energy.
D) has potential energy only.
E) has kinetic energy only.
14.
The internal pH of most cells is near neutral. This allows
A) rapid fluctuations between acidic and basic conditions within the cells.
B) enzymes within the cell to act at peak efficiency.
C) enzymes outside of these cells to function.
D) the buffers produced within the body to affect these cells.
E) water to break down into H+ and OH-.
15.
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) ionization of water.
E) hydrogen bonding.
16.
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.
17.
In photosynthesis, the light-dependent reactions
A) are uncoupled from the light-independent reactions.
B) can take place day or night.
C) produce ATP and energy stored in electron carriers.
D) lead to carbon fixation.
E) produce ADP and carbon dioxide.
18.
The role of oxygen in cellular respiration is to
A) aid in the transport of pyruvate into the mitochondria.
B) act as the final electron acceptor.
C) allow glycolysis to continue.
D) supply an energy molecule.
E) combine with carbon atoms to form carbon dioxide.
19.
The majority of ATP produced in cellular respiration is produced during
A) fermentation.
B) the Krebs cycle.
C) glycolysis.
D) the electron transport chain.
E) anaerobic processes.
20.
What method is often used by cells to move large solid material into the cell?
A) phagocytosis.
B) facilitated diffusion.
C) active transport.
D) simple diffusion.
E) exocytosis.