DO THIS EXAM IF THE LAST DIGIT OF YOUR SOCIAL is ZERO
or an EVEN NUMBER. If last # of social is odd do exam B. I won’t
grade your exam if you don’t follow directions correctly.
TAKE HOME EXAM A:
1. Animals living in colder climates have more unsaturated fats in their cell membranes than saturated fats. Why?
(15pts)
2.
Classify the molecule below (sphingolipid, cerebroside, phospholipid, monosaccharide, starch or
amylopectin) The last carbon on the right should be a methyl group (the “3” is missing) (15pts)
O
O
CH3CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2COCH2CHOCCH2(CH2)12(CH2CH=CH)3CH3
OH
CH2
OH
OPO3
OH
OH
3.
Give the structure for a phosphatidyl ethanolamine that contains two palmitic acid groups. (15pts)
4.
Draw the Hayworth projection of alpha-D-mannose (10pts)
5.
a.
b.
c.
d.
e.
f.
g.
h.
i.
True or False. Rewrite each incorrect statement to make it correct: 20pts
There are 8 stereoisomers of the aldopentoses
Dextrose is glucose
Humans are incapable of using cellulose directly as food.
Fructose can be classifided as a hexose, a monosaccharide and an aldose
Carbohydrates that are capable of reducing copper ions in Benedicts reagent are called reducing sugars
The polylsaccharides cellulose, starch and glycogen are all composed of glucose units
Sucrose, glucose, galactose and fructose are reducing sugars
Oxidation of D-erythrose with dilute nitric acid yields meso-tartaric acid
The amylase polysaccharide coils into a helical shape
6.
a.
b.
c.
d.
e.
Give the name of a carbohydrate for each of the following descriptions: 15pts
a sugar composed of glucose and fructose
the storage form of carbohydrate in plants
the storage form of carbohydrates in animals
A carbohydrate tht is used for structure in plants
A monosaccharide that combines with glucose to form lactose
7.
Question 20, chapter 19, p526 in textbook
10pts