15287372
Descripción
Test por Jessica Dewald, actualizado hace alrededor de 2 meses
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Creado por Jessica Dewald
hace más de 6 años
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Pregunta 1
Pregunta
An enzyme _____ the activation energy to speed up a chemical reaction.
Respuesta
-
stabilizes
-
raises
-
lowers
-
eliminates
Pregunta 2
Pregunta
An appropriate enzyme to catalyze a reaction involving the imaginary substance camelsine would be ___.
Respuesta
-
camelose
-
cameline
-
camelise
-
camelase
Pregunta 3
Pregunta
The charge of the oxygen atom that makes up water is slightly ___.
Respuesta
-
positive
-
negative
-
unstable
-
neutral
Pregunta 4
Pregunta
A substance that produces an excess of hydroxide (OH-) ions in water is a [blank_start]base[blank_end].
Respuesta
-
base
Pregunta 5
Pregunta
Water is classified as a [blank_start]polar[blank_end] molecule because it has a negatively charged oxygen and positively charged hydrogens.
Respuesta
-
polar
Pregunta 6
Pregunta
A substance that produces an excess of hydrogen (H+) ions in water is a(n) [blank_start]acid[blank_end].
Respuesta
-
acid
Pregunta 7
Pregunta
The term hydrophobic means water fearing.
Respuesta
- True
- False
Pregunta 8
Pregunta
The type of bond which holds water molecules to each other is called a [blank_start]hydrogen bond.[blank_end]
Respuesta
-
hydrogen bond
Pregunta 9
Pregunta
A pH of 7 signifies?
Respuesta
-
a salt solution
-
an acidic solution
-
a neutral solution
-
a basic solution
Pregunta 10
Pregunta
The polar compound which is the universal solvent and has the unique properties of adhesion, capillary action, and cohesion is [blank_start]water[blank_end].
Respuesta
-
water
Pregunta 11
Pregunta
Which of the following is NOT a property of water?
Respuesta
-
nonpolar
-
cohesion
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hydrogen bonding
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capillary action
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adhesion
Pregunta 12
Pregunta
A protein catalyst that speeds up the chemical reaction within an organism
Respuesta
-
homeostasis
-
protein
-
enzyme
-
metabolism
Pregunta 13
Respuesta
-
Substrate
-
Product
-
Enzyme
Pregunta 14
Pregunta
A water molecule is made up of [blank_start]2[blank_end] hydrogen atoms and [blank_start]1[blank_end] oxygen atom.
Respuesta
-
1
-
2
-
1
-
2
Pregunta 15
Pregunta
Water’s ability to stick to itself is [blank_start]cohesion[blank_end],
Respuesta
-
cohesion
Pregunta 16
Pregunta
Water striders have the ability to walk on water because of [blank_start]surface tension[blank_end].
Respuesta
-
surface tension
Pregunta 17
Pregunta
Which property of water does NOT play a role in water's ability to climb the xylem of a plant?
Respuesta
-
cohesion
-
adhesion
-
surface tension
-
capillary action
Pregunta 18
Pregunta
Water can hang as a dew drop from the underside of a leaf due to [blank_start]adhesion[blank_end].
Respuesta
-
adhesion
Pregunta 19
Pregunta
Water is known as a universal solvent because
Respuesta
-
It dissolves so many substances
-
It exists in all three states on Earth
-
It can cling to fibers of cloth and paper
-
Its frozen form floats on its liquid form
Pregunta 20
Pregunta
The properties of water make it essential for supporting life on Earth. One of its properties helps it to act as a buffer for temperature changes, which stabilizes the environment for creatures that live in water. Which property is this?
Respuesta
-
High heat of vaporization
-
High specific heat
-
Surface tension
-
Cohesion
Pregunta 21
Pregunta
What binds to the enzyme at the active site?
Respuesta
-
Product
-
Substrate
-
Inhibitor
-
Competitor
Pregunta 22
Pregunta
What environmental conditions can cause an enzyme to denature?
Respuesta
-
Salinity
-
pH
-
Temperaure
-
Substrate concentration
Pregunta 23
Pregunta
Most Enzyme names end in -ase.
Respuesta
- True
- False
Pregunta 24
Pregunta
Enzymes are not reusable after a chemical reaction.
Respuesta
- True
- False
Pregunta 25
Pregunta
Inhibitors that bind to an enzyme and alters the shape of the active site are called [blank_start]noncompetitive[blank_end], while inhibitors that bind and block active site are called [blank_start]competitive[blank_end].
Respuesta
-
Noncompetitive
-
Competitive
-
Noncompetitive
-
Competitive
Pregunta 26
Pregunta
The optimal pH of Chymotrypsin is [blank_start]7.5[blank_end].
Respuesta
-
7.5
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