bio mol

Question 1

the protien drawing chemically

Answer 1

H OH
-N-C-C
H O

Question 2

DNA REP 1-4

Answer 2

1- h2 bonds broken by helicase dna
2- nucelotides in nucleus pair with free/open bases AT-CG
3- identical
4-phosphodiester bonds at new strands backbone between c3 and c5 by dna polymerase

Question 3

h20 properties -5

Answer 3

1- metabolite= speeds up chem recations- condesnation and hydrolysis
2-good solvent- dissolves substances= easier transport
3- high specific heat capactiy- alot of ennergy required to raise temp ensuring stabilty of enxyme etc
4-large latent heat - lots of energy is needed to make watervapour due to many hydrogen bonds leading to less water loss
5- strong cohesion- can move up as one continuous string up zylem

Question 4

food test- protine

Answer 4

biuret solutiun added-blue to purple= present

Question 5

food test-starch

Answer 5

iodine solution=blueblack= present

Question 6

food test lipids

Answer 6

add ethanol THEN water then shake and a white emulsion should form

Question 7

food test- reducing sugar

Answer 7

food sample and benedict in equal volumes
in h20 bath for 5 mins- blue to green/yellow/orange/red= present

Question 8

food test- non reducing sugar

Answer 8

new food sample add hcl and heat in bath to break glycosidic
add sodium hydrogen carbonate to neutralise so benidict can work
heat sample in h20 bath for 5 mins
if colour change present

Question 9

starch structures- glucogen

Answer 9

1-4 and 1-6
alpha
insoluble
large and compact

Question 10

starch structyre- amylose

Answer 10

1-4
alpha
insoluble
large and compact

Question 11

starch structure amylopectin

Answer 11

1-4 and 1-6
alpha
insoluble
large and compact

Question 12

starch - cellulose

Answer 12

1-4
alpha
insoluble
large and compact
microfibrils= hydrogen bonding is adjacent lots of them from strong threads of cellulose = strength for cell wall