Chapter #5 - Enzymes Flashcards

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1
Q

What are enzymes?

A

Proteins that act as biological catalysts.

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2
Q

What is the definition of a catalyst

A

A substance that increases the rate of a chemical reaction and is not changed by the reaction.

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3
Q

What would happen if enzymes were not present in your body?

A

Everything would happen too slowly and organisms wouldn’t be able to sustain life.

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4
Q

What is the enzyme for starch?

A

Amylase

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5
Q

What is the enzyme for proteins?

A

Protease

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6
Q

What is the enzyme for carbohydrates?

A

Carboydrases

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7
Q

What helps break down lipids

A

Lipases

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8
Q

What helps breaks DNA?

A

DNAses

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9
Q

What helps break down maltose

A

Maltase

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10
Q

Why are some people lactose intolerant?

A

Because their bodies do not produce lactase so they therefor cannot tolerate drinking milk.

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11
Q

What is DNA?

A

The material that makes up chromosomes.

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12
Q

What are chromosomes?

A

organized chunks of DNA

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13
Q

What are genes?

A

Sequences of DNA with a function.

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14
Q

DNA is…..

A

double stranded

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15
Q

DNA carries…

A

Codes which instruct the cell which proteins to build. It says which amino acids to link together and in what order.

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16
Q

What determines the code?

A

The sequences of bases in the DNA

17
Q

What are nucleotides?

A

molecules that link together in long chains to make DNA molecule. Each nucleotide contains a base.

18
Q

How many bases are there and what are they each called?

A

4 bases
A
C
G
T

19
Q

What are bases?

A

one of the components of DNA; there are four bases, A, G, T, C, and their sequnces determines genetical info and which proteins are made in a cell.

20
Q

What is the structure of a DNA molecule?

A

DNA molecules are made up of two chains of nucleotides coiled around one another called a double helix. The 2 chains are held together by complementary base pairs.

21
Q

What are the complementary base pairs?

A

A and T
C and G

22
Q

What is an example of a protease?

A

Pepsin

23
Q

What is catalase?

A

An enzyme that works in all cells. it breaks down a harmful chemical called hydrogen peroxide (H2O2) into water+oxyden.

24
Q

What is hydrogen peroxide?

A

A byproduct of many chemical reactions in cells.

25
Q

Describe a structure of an enzyme?

A

The active site is where the substrate attaches to the enzyme. The substrate molecule has a complementary shape to the active site of the enzyme.

They bind to form a substrate enzyme complex.

The enzyme than changes the substrate into new molecules product.

26
Q

What factors affect enzymes?

A

temp. and pH. Every enzyme has an optinal temp. and pH, at which they work the fastest.

27
Q

What is the most common optimum pH? and why?

A

pH 7 (neutral) because that is the pH in our body and cells.

some cell’s optimum pH is 2 because they are adapted to work in the stomach.

28
Q

At what temperature do most enzymes stop working?

A

at above 50 degrees celsius most enzymes denature. (Change shape and do not fit a substrate anymore.) And stop working.

29
Q

What is the ideal temp. for enzymes?

A

For most enzymes is 37 degrees celcius. (the average/ideal body temp.)

30
Q

What is an example of how enzymes denature?

A

Protease has a optimal pH of 2 because it works in your stomach. However, at pH 2 the enzyme amylase (in your saliva) denature and doesn’t work.