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Worksheetsbiochem try
Total questions: 28
Worksheet time: 28mins
Name
Class
Date
1.
what is the chemical formula of fructose
a)
c5h1205
b)
c6h12o6
c)
c6h12o5
d)
c5h12o6
2.
what is the difference between the high-CHO carbohydrate and the control group
a)
endurance level of cyclists
b)
length of exercise
c)
number of sprints
d)
carbohydrate intake before trial
3.
by what factor does the surface area increase from the single cube to the 27 cubes on the right
a)
3
b)
27
c)
1
d)
2
4.
what is the difference between the person A than that person B (red line)
a)
person B is in really good shape and therefore metabolizes carbohydrates quicker
b)
person A ate a lot more than person B
c)
person A is not capable of producing insulin
d)
person B is not capable of absorbing the nutrition from the food they have eaten
5.
what is glycemic index
a)
it was first developed as a strategy for guiding food choices for people w kidney failure
b)
refers to the specific diet plan that used the index as the primary or only guide for meal planning
c)
a system of assigning a number to carbohydrate-containing foods according to how much each food increases blood sugar
d)
the decrease of sugar in the blood
6.
sucrose is a disaccharide. What are the two bldg blocks of sucrose
a)
two glucose rings
b)
fructose and glucose
c)
glucose and galactose
d)
two fructose rings
7.
what strong acid is produced by the stomatch that helps to degrade the food and kills microorganisms
a)
hydrochloric acid
b)
phosphoric acid
c)
sulfuric acid
d)
nitric acid
8.
carbohydrates are one of the main types of nutrients. Term described molecules consisting of
a)
carbon, oxygen, and hydrogen
b)
carbon and hydrogen
c)
carbon and helium
d)
carbon dioxide and hydrogen
9.
you might have never seen the structure of this molecule before, but you are very familiar with it. Which of the ff drinks contains a lot of sucrose
a)
bottled mineral water
b)
ice cold beer
c)
freshly squeezed orange juice
d)
diet coke
10.
so if you only know the chemical formula of a sugar, you cannot tell what molecule it is. What is the difference between glucose and fructose
a)
no. of double bonds
b)
arrangement of functional groups
c)
no. of oxygen atoms linked to carbon atoms
d)
chemical formula
11.
salts can denature proteins. True or false
a)
True
b)
False
12.
what happens when 70% alcohol is added in a protein solution
a)
there is production of lumps
b)
alcohol disrupts the ionic bonds present in the quaternary, tertiary and secondary structure, forming new interactions bet the added alcohol and the amino acids
c)
the addition of alcohol leads to the unfolding of the proteins from tertiary and quaternary structure until they get to their secondary structure
d)
this leads to the exposure of hydrophilic amino acids to the surface as they are more soluble in organic solvents such as alcohols and subsequently a change in protein conformation that denatures the protein
13.
what are NOT formed in the secondary structure of proteins
a)
beta pleated sheets
b)
alpha helices
c)
subunits
d)
random coils
14.
what happens when metals are added in a protein solution
a)
metals causes the solution are added in a protein solution
b)
protein is denatured causing it to dissolve completely in the solution
c)
the solution becomes homogenous because metals dissolve the protein to form metal-protein complex
d)
proteins precipitate out of the solution as an insoluble metal-protein salt
15.
which of the ff is NOT an example of the products of protein denatuation
a)
egg white
b)
cheese
c)
mayonnaise
d)
gelatin
16.
in the protein denaturation experiment, what do we need to use distilled water for
a)
for washing the proteins off
b)
as the negative control
c)
for washing the beaker clean
d)
as the positive control
17.
in the protein denaturation experiment, what happens to the distilled water when a strong acid is added
a)
the color will change to blue due to the addition of acid
b)
the color will change to pink due to the addition of acid
c)
nothing will happen
d)
there will be less lumps in the ovalbumin solution
18.
what levels of protein structure are affected when adding weak bases to them
a)
only primary level
b)
only secondary level
c)
only tertiary and quaternary levels
d)
only quaternary levels
19.
what happens to protein when you apply heat or mechanical forces
a)
heat application leads to the partial unfolding of proteins, as only quaternary, and tertiary structures are lost
b)
heat increases the kinetic energy and causes the molecules to vibrate so rapidly and violently that hydrogen bonds and hydrophobic interactions are disrupted
c)
the use of mechanical forces does not disrupt quaternary, tertiary and secondary structures
d)
the addition of mechanical forces such as stirring or agitation does not cause protein denaturation
20.
what happens when milk is not well preserved
a)
it becomes lumpy in texture
b)
it becomes acidic
c)
there is formation of new interaction between secondary structures of the protein casein
d)
all of the above
21.
why didn't you just clean the spill with water
a)
the acid reacts with water
b)
it could ignite
c)
it would pollute the water
d)
the acid freezes the water
22.
why is it dangerous to wear contact lenses in the lab
a)
they don't protect well enough
b)
liquid can be trapped under them
c)
the plastic reacts with acids
d)
glasses protect better than lenses
23.
what do you have to do if there is an unexpected violent chemical reaction in a bottle
a)
put the lid on the bottle
b)
add baking soda for neutralization
c)
evacuate
d)
add water
24.
what should you NOT do if a person's clother suddenly catch fire
a)
stop them and smother the fire by rolling them on the floor
b)
wrap a fire blanket around a standing person
c)
splash them with a bucket of water
d)
drag them under a safety shower
25.
never use a CO2, based extinguisher on a person. Do you know the reason why?
a)
CO2 is freezing cold
b)
the person would suffocate
c)
CO2 is toxic
d)
CO2 is corrosive
26.
what do you have to do before leaving the lab, to make sure you don't carry traces of chemicals outside
a)
take off your lab coat and wash your hands
b)
wash your hands and then remove your lab coat
c)
turn off the main power
d)
tell your supervisor
27.
the cell membrane makes the cell a compartment separate from the extracellular environment. What is the other main function of the cell membrane
a)
providing a rigid structure that gives the cell shape
b)
controlling the transport of substances in and out of the cell
c)
facilitating the migration of the cell through the body
d)
compartmentalizing organelles within the cell
28.
due to the composition of the cell membrane, some molecules can cross the membrane more easily than others. This is called relative permeability. Which type of molecule is at least able to cross the membrane w/o transporters
a)
large uncharged polar molecules
b)
small hydrophobic molecules
c)
ions
d)
small uncharged polar molecules
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