AS biological molecules questions

Question 1

Describe the chemical reactions involved in the conversion of polymers to
monomers and monomers to polymers.
Give two named examples of polymers and their associated monomers to
illustrate your answer.

Answer 1

the reaction to joins monomers together to form polymers is called a condensation reaction wich forms a chemical bond while releasing water.
for example amino acids may undergo condensation reaction via the removal of water to form a polypeptide which is an example of a polymer
the chemical reaction involved in the conversion of polymers to monomers is a hydrolysis reaction, by witch water is added to break the polymer into monomers.
anouther example of a polymer is DNA. DNA can undergo a hydrolisis reaction to release necleotide bases such as guanine

Question 2

give two examples of polymers

Answer 2

DNA
Reverse tramscriptase

Question 3

define a monomer

Answer 3

a monomer is a molecule from which larger molecules are made

Question 4

when a substance BPG binds to heamoglobin it reduces affinity of heamoglobin foroxygen. as a result wich way does the dissociation curve shift

Answer 4

to the right

Question 5

what are the properties of water

Answer 5

high specific latent heat
a solvent for other molecules
cohesion tension forms columns of water
cohesion surface tension
metabolic reactant

Question 6

what is the test for lipid/non-reducing starch/amalyse

Answer 6

lipid - elmulsion test= ethenol+ water- shake= cloudy white precipitate
non- reducing starch
non-reducing sugars- benadics test - blue - green- yellow-orange-brickred
amalyse- iodine- orange- blue/black

Question 7

Describe the structure of glycogen.

Answer 7

glycogen is made from a-glucose molecse in a branched chain sequence

Question 8

During early pregnancy, the glycogen in the cells lining the uterus is an
important energy source for the embryo.
Suggest how glycogen acts as a source of energy.
Do not include transport across membranes in your answer.

Answer 8

glycogen is made of a-glucose molecules. the structure of glycogen is branched meaning it is easliy hydrolysed to release alpha glucose, wich is readlily availiable source of energy for the embryo

Question 9

Name the monomers from which a maltose molecule is made.

Answer 9

glucose

Question 10

Name the type of chemical bond that joins the two monomers to form
maltose.

Answer 10

alphpa 4 glycosidic bond