Enzymes flashcards


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What are enzymes? enzymes are biological catalysts that increase metabolic reactions
Enzyme is a greek word which means? in Yeast
what is the role of enzymes during reactions? enzymes lower the activation energy of a reaction
Most natural enzymes are? Proteins
Enzymes are _______ in size than the substrate? Greater in size than the substrate
Can enzymes react with acidic and alkaline substances? Yes, enzymes can react with acidic and alkaline substances
Enzymes are classified into ______ classes? six
The non-protein part in conjugated enzymes is known as? prosthetic group
The protein part of a conjugated enzyme is known as? Apoenzymes
what is the function of enzyme at 0 degrees Celsius? The enzyme's activity is reduced to minimum but the enzyme is not destroyed
Enzymes can be denatured at ______ temperatures? High temperatures
The molecule that binds to the active site of an enzyme is known as? competitive inhibitor
The biological control for the regulation of most of the enzymes is provided by? Feedback inhibition
Enzymes are sensitive to? PH, heat, acidity, UV and X-rays
What are enzymes made of? Enzymes are made up of an Active site which is the part that catalysis a substrate.
Are they used up in a chemical reaction? They are not used up in the reaction
What is significant about an enzyme’s shape? It only fits on certain substrates
What are the three working conditions for enzymes? Temperature, pH, and concentration
why does the body need enzymes? almost all reactions in the body need enzymes. They are used in the metabolism of carbs, fats and proteins
what are coenzymes? cofactors are inorganic components that are needed to work e.g Zn, Se
what are cofactors? they are organic components that are needed to work e.g niacin or folate
what are Apoenzymes? they are proteins parts of enzymes
what is activation energy? it is the boost of energy needed for a reaction to start
how do enzymes help activation energy? enzymes lower the activation energy allowing the reaction to occur at lower temperatures
what kind of shape do enzymes have? they have a globular shape
enzymes are _________ catalyst? biological catalyst
how do enzymes differ from inorganic catalyst? they are specific, they have a much greater efficiency and they catalyst the reaction in soft conditions
who discovered that some molecules in ribonucleic acid also function as enzymes? Sidney Altman and Thomas Cesh
Molecules of ribonucleic acids that function as enzymes are called? Ribozymes
Amylase is an enzyme that is entirely composed of _______? proteins
What does the lock and key hypothesis state? It states that the shape of the Active site is exactly complementary to the shape of the substrate
who proposed the Lock and Key Hypothesis?, The Lock and Key Hypothesis was proposed by Fisher in 1898
can proteins change their shape? some proteins can change their shape (conformation)
who proposed the induced fit hypothesis? The induced fit hypothesis was proposed by Koshland in 1959
what is an allosteric site? an allosteric site is a site on an enzyme that binds to a molecule in a cellular environment
what kind of bonds does allosteric site form? allsosteric site forms weak noncovalent bonds
The inorganic ions which act as a posthetis group in holoenzymes are classed? co-factors
Organic cofactors cab either be _______ or _____ prosthetic groups or coenzymes
Enzymes that need cofactors but do not have one bound are called? apoenzymes or apoproteins
apoenzymes together with its cofactor is called? holoenzyme
The organic prosthetic group in holoenzymes is known as? Co-enzyme
co-enzymes constitute _______ % portion of entire enzyme molecule? 1% portion of entire enzyme molecule
co-enzyme include which minerals? magnesium, Flavin Mononucleotide
Most vitamins are _______? Co-enzymes

What are enzymes?

Enzyme is a greek word which means?

what is the role of enzymes during reactions?

Most natural enzymes are?

Enzymes are _______ in size than the substrate?

Can enzymes react with acidic and alkaline substances?

Enzymes are classified into ______ classes?

The non-protein part in conjugated enzymes is known as?

The protein part of a conjugated enzyme is known as?

what is the function of enzyme at 0 degrees Celsius?

Enzymes can be denatured at ______ temperatures?

The molecule that binds to the active site of an enzyme is known as?

The biological control for the regulation of most of the enzymes is provided by?

Enzymes are sensitive to?

What are enzymes made of?

Are they used up in a chemical reaction?

What is significant about an enzyme’s shape?

What are the three working conditions for enzymes?

why does the body need enzymes?

what are coenzymes?

what are cofactors?

what are Apoenzymes?

what is activation energy?

how do enzymes help activation energy?

what kind of shape do enzymes have?

enzymes are _________ catalyst?

how do enzymes differ from inorganic catalyst?

who discovered that some molecules in ribonucleic acid also function as enzymes?

Molecules of ribonucleic acids that function as enzymes are called?

Amylase is an enzyme that is entirely composed of _______?

What does the lock and key hypothesis state?

who proposed the Lock and Key Hypothesis?,

can proteins change their shape?

who proposed the induced fit hypothesis?

what is an allosteric site?

what kind of bonds does allosteric site form?

The inorganic ions which act as a posthetis group in holoenzymes are classed?

Organic cofactors cab either be _______ or _____

Enzymes that need cofactors but do not have one bound are called?

apoenzymes together with its cofactor is called?

The organic prosthetic group in holoenzymes is known as?

co-enzymes constitute _______ % portion of entire enzyme molecule?

co-enzyme include which minerals?

Most vitamins are _______?

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