science quiz, science homework help

science quiz, science homework help

Question 1
Because of the atomic structure of carbon, it tends to form

A.
hydrogen bonds.

B.
covalent bonds.

C.
sulfide bonds.

D.
bonds only with hydrogen.

E.
ionic bonds.

Question 2

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

A.
kinetic energy.

B.
light.

C.
chemical energy.

D.
activation energy.

E.
heat.

Question 3

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

A.
amount of genetic material.

B.
differences between viral particles and eukaryotic cells.

C.
surface-to-volume ratio.

D.
inability to produce more components of the cell membrane.

E.
fact that they cannot possess sufficient numbers of organelles for normal cell functioning.

Question 4

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

A.
has kinetic energy only.

B.
has potential energy only.

C.
has both potential energy and kinetic energy.

D.
is using up chemical energy.

E.
is constantly gaining more energy.

Question 5

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

A.
phagocytosis.

B.
exocytosis.

C.
simple diffusion.

D.
active transport.

E.
facilitated diffusion.

Question 6

With few exceptions, organic compounds are those that contain

A.
all of the above.

B.
hydrogen.

C.
oxygen.

D.
nitrogen.

E.
carbon.

Question 7

The majority of ATP produced in cellular respiration is produced during

A.
the electron transport chain.

B.
glycolysis.

C.
anaerobic processes.

D.
fermentation.

E.
the Krebs cycle.

Question 8

Surface tension of water is due to

A.
ionization of water.

B.
the ability of water to act as a solvent.

C.
hydrogen bonding.

D.
water molecules repelling each other.

E.
ionic bonding.

Question 9

In a cell,

A.
energy-absorbing reactions and energy-releasing reactions are unlinked.

B.
energy-releasing reactions are coupled to energy-absorbing reactions.

C.
more energy is used up than is produced.

D.
energy-absorbing reactions are coupled to energy-releasing reactions via electron carriers.

E.
there are many more energy-absorbing reactions than energy-releasing reactions.

Question 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.
2, 3, 4, 1

B.
1, 4, 3, 2

C.
1, 2, 3, 4

D.
1, 3, 2, 4

E.
2, 1, 3, 4

Question 11

All enzymes act by

A.
lowering the activation energy of specific chemical reactions.

B.
breaking and forming ionic bonds between ions.

C.
raising the activation energy of specific chemical reactions.

D.
breaking hydrogen bonds between molecules.

E.
allowing products to be changed during the chemical reactions.

Question 12

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.
water

E.
carbon dioxide.

Question 13

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

A.
water to break down into H+ and OH-.

B.
enzymes within the cell to act at peak efficiency.

C.
rapid fluctuations between acidic and basic conditions within the cells.

D.
the buffers produced within the body to affect these cells.

E.
enzymes outside of these cells to function.

Question 14

The most common energy-carrying molecule in the cell is

A.
ADP.

B.
AMP.

C.
adenine.

D.
DNA.

E.
ATP.

Question 15

The role of oxygen in cellular respiration is to

A.
act as the final electron acceptor.

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

C.
supply an energy molecule.

D.
combine with carbon atoms to form carbon dioxide.

E.
allow glycolysis to continue.

Question 16

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

A.
hydrogen

B.
carbon

C.
silicon

D.
oxygen

E.
aluminum

Question 17

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

A.
a polar molecule.

B.
a nonpolar molecule.

C.
a neutral molecule.

D.
a charged molecule.

Question 18

In photosynthesis, the light-dependent reactions

A.
are uncoupled from the light-independent reactions.

B.
can take place day or night.

C.
produce ADP and carbon dioxide.

D.
lead to carbon fixation.

E.
produce ATP and energy stored in electron carriers.

Question 19

Rank the following chemical bonds from weakest to strongest:

A.
ionic, hydrogen, covalent

B.
hydrogen, ionic, covalent

C.
hydrogen, covalent, ionic

D.
covalent, ionic, hydrogen

E.
ionic, covalent, hydrogen

Question 20

The atomic nucleus consists of

A.
neutrons and electrons.

B.
neutrons only.

C.
protons and electrons

D.
protons only.

E.
neutrons and protons.

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