7892753
Descrição
Quiz por Daniel Brand, atualizado more than 1 year ago
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Criado por Daniel Brand
aproximadamente 7 anos atrás
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Questão 1
Questão
Which of the following statements correctly relates to enzymes? Check all that apply.
Responda
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They are biological catalysts.
-
They are used up during reactions.
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They are effective in small amounts.
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They are found exclusively inside cells.
Questão 2
Questão
Unlike [blank_start]chemical[blank_end] catalysts, enzymes do not require [blank_start]extreme[blank_end] temperatures or [blank_start]pH[blank_end] to function efficiently. Also, they [blank_start]don't[blank_end] produce by-products, are highly [blank_start]specific[blank_end], and their activity can be regulated by cells.
Responda
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chemical
-
biological
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gastrointestinal
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gaseous
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extreme
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mild
-
pH
-
osmotic pressures
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by-catalysts
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dilution
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don't
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do
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usually
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specific
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acidic
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uncommon
-
insoluble
Questão 3
Questão
Metabolic substrates and products sometimes regulate the activity of enzymes in their own and other metabolic pathways.
Responda
- True
- False
Questão 4
Questão
[blank_start]Catalase[blank_end] is an example of a four-polypeptide intracellular enzyme. It breaks down [blank_start]hydrogen[blank_end] [blank_start]peroxide[blank_end] into oxygen and [blank_start]water[blank_end]. [blank_start]Amylase[blank_end] is an extracellular enzyme produced by the [blank_start]pancreas[blank_end] and released into the [blank_start]small[blank_end] [blank_start]intestine[blank_end]. It breaks down [blank_start]starch[blank_end] into maltose. Similarly, t[blank_start]rypsin[blank_end] breaks down proteins into peptides.
Responda
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rypsin
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Amylase
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Catalase
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hydrogen
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peroxide
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water
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pancreas
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small
-
intestine
-
starch
Questão 5
Questão
Enzymes bind to their substrate at their [blank_start]active[blank_end] site. This consists of [blank_start]6-10[blank_end] amino acids that form a [blank_start]tertiary[blank_end] structure which is [blank_start]complementary[blank_end] and [blank_start]specific[blank_end] to the substrate.
The role of [blank_start]cofactors[blank_end] is to ensure that enzymes act at the appropriate rate.
Responda
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active
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charged
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tertiary
-
specific
-
6-10
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2-4
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60-100
-
150-200
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tertiary
-
primary
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secondary
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quaternary
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complementary
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reduced
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synthesised
-
primary
-
specific
-
non-specific
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an oxidising agent
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a reducing agent
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cofactors
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vitamins
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active sites
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polypeptides
Questão 6
Questão
ESC stands for [blank_start]enzyme[blank_end] [blank_start]substrate[blank_end] [blank_start]complex[blank_end].
Responda
-
enzyme
-
substrate
-
complex
Questão 7
Questão
Which of the following statements are TRUE about enzyme action?
Responda
-
Enzyme-substrate collisions are random.
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Enzyme-substrate collisions happen less frequently when heat/kinetic energy is high.
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Enzyme active site and substrate are specific and complementary.
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The ESC is usually held together by covalent bonds.
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Substrate(s) is/are broken down or combined while in the ESC.
Questão 8
Questão
The ESC is unstable, holding more energy than the substrate(s), which in turn holds more energy than the product(s).
Responda
- True
- False
Questão 9
Questão
According to the [blank_start]induced[blank_end] fit hypothesis, formation of the ESC creates subtle changes in the [blank_start]active site[blank_end] [blank_start]tertiary[blank_end] structure, which allows [blank_start]bonds[blank_end] to break and form during the biological reaction.
Responda
-
induced
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lock and key
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active site
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solubility
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pH
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tertiary
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primary
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secondary
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quaternary
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bonds
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polypeptides
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enzymes
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the lock-and-key
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