1. Because of the atomic structure of carbon, it tends to form A) bonds only wit
ID: 33 • Letter: 1
Question
1. Because of the atomic structure of carbon, it tends to form
A) bonds only with hydrogen.
B) sulfide bonds.
C) hydrogen bonds.
D) covalent bonds.
E) ionic bonds.
2. A hummingbird is %u201Cdrinking%u201D nectar containing sugar from a red columbine flower. Arrange the following events to occur in the hummingbird in order from the first to last:
1. Glucose sugar is converted to pyruvate.
2. Energy from high-energy electrons is released from an electron transport chain. This energy is used to make ATP.
3. The hummingbird exhales carbon dioxide and energy is stored in electron carriers.
4. The hummingbird has the ability to beat its wings 40 %u2013 80 times a second.
A) 2, 3, 4, 1
B) 2, 1, 3, 4
C) 1, 3, 2, 4
D) 1, 4, 3, 2
E) 1, 2, 3, 4
In photosynthesis, the light-dependent reactions
A) are uncoupled from the light-independent reactions.
B) lead to carbon fixation.
C) produce ATP and energy stored in electron carriers.
D) can take place day or night.
E) produce ADP and carbon dioxide.
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) water
D) ATP
E) oxygen
Surface tension of water is due to
A) ionic bonding.
B) the ability of water to act as a solvent.
C) ionization of water.
D) water molecules repelling each other.
E) hydrogen bonding.
What method is often used by cells to move large solid material into the cell?
A) exocytosis.
B) phagocytosis.
C) facilitated diffusion.
D) active transport.
E) simple diffusion.
The role of oxygen in cellular respiration is to
A) aid in the transport of pyruvate into the mitochondria.
B) combine with carbon atoms to form carbon dioxide.
C) allow glycolysis to continue.
D) act as the final electron acceptor.
E) supply an energy molecule.
All enzymes act by
A) breaking and forming ionic bonds between ions.
B) lowering the activation energy of specific chemical reactions.
C) allowing products to be changed during the chemical reactions.
D) breaking hydrogen bonds between molecules.
E) raising the activation energy of specific chemical reactions.
With few exceptions, organic compounds are those that contain
A) carbon.
B) nitrogen.
C) all of the above.
D) ocygen.
E) hydrogen.
The most common energy-carrying molecule in the cell is
A) adenine.
B) ATP.
C) AMP.
D) DNA.
E) ADP.
The internal pH of most cells is near neutral. This allows
A) enzymes outside of these cells to function.
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) the buffers produced within the body to affect these cells.
Because the shared electrons between hydrogen and oxygen spend more time orbiting the oxygen than the hydrogen, water is
A) a charged molecule.
B) a nonpolar molecule.
C) a polar molecule.
D) a neutral molecule.
This element is prominent in both living organisms and in the Earth%u2019s surface.
A) carbon
B) aluminum
C) silicon
D) hydrogen
E) oxygen
The majority of ATP produced in cellular respiration is produced during
A) the electron transport chain.
B) fermentation.
C) glycolysis.
D) anaerobic processes.
E) the Krebs cycle.
As one form of energy is converted into another, there is always some energy lost as
A) chemical energy.
B) light.
C) kinetic energy.
D) activation energy.
E) heat.
In a cell,
A) energy-absorbing reactions and energy-releasing reactions are unlinked.
B) there are many more energy-absorbing reactions than energy-releasing reactions.
C) energy-releasing reactions are coupled to energy-absorbing reactions.
D) more energy is used up than is produced.
E) energy-absorbing reactions are coupled to energy-releasing reactions via electron carriers.
Rank the following chemical bonds from weakest to strongest:
A) hydrogen, ionic, covalent
B) ionic, covalent, hydrogen
C) hydrogen, covalent, ionic
D) ionic, hydrogen, covalent
E) covalent, ionic, hydrogen
The atomic nucleus consists of
A) protons and electrons
B) neutrons and electrons.
C) neutrons and protons.
D) protons only.
E) neutrons only.
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) surface-to-volume ratio.
C) amount of genetic material.
D) differences between viral particles and eukaryotic cells.
E) inability to produce more components of the cell membrane.
A stone is pushed from the top of a hill. Halfway to the bottom of the hill, this rolling stone
A) is using up chemical energy.
B) has potential energy only.
C) has kinetic energy only.
D) has both potential energy and kinetic energy.
E) is constantly gaining more energy
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