Multiple Choice Quizzes - Life Sciences

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Question 1

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 polar molecule.
	C.	a neutral molecule.
	D.	a charged molecule.

5 points

Question 2

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.	enzymes outside of these cells to function.
	D.	water to break down into H+ and OH-.
	E.	rapid fluctuations between acidic and basic conditions within the cells.

5 points

Question 3

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

5 points

Question 4

In a cell,

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

5 points

Question 5

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

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

5 points

Question 6

The most common energy-carrying molecule in the cell is

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

5 points

Question 7

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 potential energy only.
	C.	has kinetic energy only.
	D.	has both potential energy and kinetic energy.
	E.	is using up chemical energy.

5 points

Question 8

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

5 points

Question 9

Surface tension of water is due to

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

5 points

Question 10

All enzymes act by

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

5 points

Question 11

With few exceptions, organic compounds are those that contain

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

5 points

Question 12

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

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

5 points

Question 13

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

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

5 points

Question 14

In photosynthesis, the light-dependent reactions

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

5 points

Question 15

Rank the following chemical bonds from weakest to strongest:

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

5 points

Question 16

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

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

5 points

Question 17

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

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

5 points

Question 18

The majority of ATP produced in cellular respiration is produced during

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

5 points

Question 19

The role of oxygen in cellular respiration is to

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

5 points

Question 20

The atomic nucleus consists of

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