UNIT 1: DNA & PROTEINS

Question 1

WHERE IS THE LOCATION OF DNA IN A CELL

Answer 1

THE NUCLEUS

Question 2

WHAT IS THE SHAPE OF A DNA MOLECULE

Answer 2

DOUBLE-HELIX

Question 3

WHAT IS THE SEQUENCE OF BASES IN A GENE

Answer 3

IT DETERMINES THE SEQUENCE OF AMINO ACIDS IN THE PROTEIN, WHICH DETERMINES THE SHAPE AND FUNCTION OF THE PROTEIN.

Question 4

WHAT DOES THE ‘MRNA’ DO

Answer 4

CARRIES A COMPLIMENTARY COPY OF THE GENETIC CODE FROM NUCLEUS TO RIBOSOME

Question 5

WHAT ARE THE 4 FUNCTIONS OF A PROTEIN?

Answer 5

1, ENZYME
2, RECEPTORS
3,HORMONE
4, ANITBODY

Question 6

PART OF THE ENZYME WHERE THE SUBSTRATE BINDS?

Answer 6

ACTIVE SITE

Question 7

WHAT ARE THE FOUR PROPERTIES OF AN ENZYME?

Answer 7

1, MADE OF PROTEIN
2, BIOLOGICAL CATALYSTS
3, HAVE AN ACTIVE SITE
4, REACT WITH A SUBSTRATE/S TO MAKE PRODUCT/S

Question 8

WHAT DOES ‘HPCOW’ STAND FOR

Answer 8

HYDROGEN PEROXIDE(is the substrate), CATALASE(is the enzyme) AND OXYGEN AND WATER(is the product/s)

Question 9

DEFINE THE TERM ‘SPECIFIC’

Answer 9

CAN ONLY REACT WITH ONE SUBSTRATE AS SHAPE OF THE ENZYMES ACTIVE SITE IS COMPLIMENTARY TO SHAPE OF SUBSTRATE.

Question 10

DEFINE THE TERM ‘OPTIMUM’

Answer 10

CONDITIONS (TEMP & pH) AT WHICH THE ENZYME IS MOST ACTIVE

Question 11

DEFINE THE TERM ‘DENATURED’

Answer 11

THE ACTIVE SITE HAS CHANGED SHAPE,(PREVENTING SUBSTRATE FROM BINDING)

Question 12

DESCRIBE THE EFFECT OF TEMP ON ENZYME ACTIVITY

Answer 12

AS TEMP INCREASES SO DOES THE RATE OF ENZYME CONTROLLED REACTION. UNTIL IT REACHES THE MAXIMUM RATE AT THE OPTIMUM TEMP.
ABOVE THE OPTIMUM TEMP THE RATE DECREASES RAPIDLY AS THE ENZYME BECOMES DENATURED.