1) a 10% glucose solution is placed in the thistle tube. the thistle tube is placed in a
beaker that contains a 5% glucose solution. where is the highest concentration of water
found?
a. in the 10% solution
b. in the 5% solution
c. the concentration of water is the same in both solutions.
d. none of the above
2) what type of tissue is striated, contains cells with one nucleus, and is not under
voluntary control?
a. skeletal muscle
b. smooth muscle
c. cardiac muscle
d. nervous tissue
3) which of the following skin derivatives is mismatched with the organism on which it
is found?
a. mammals – hair and nails
b. amphibians – epidermal scales
c. fishes – bony scales
d. birds – feathers
incorrect
4) the correct sequence of events in translation is:
a. initiation, termination, elongation.
b. elongation, termination, initiation.
c. termination, elongation, initiation.
d. elongation, initiation, termination.
e. initiation, elongation, termination.
5) which statement is not correct about the lac operon?
a. it regulates the production of a series of five enzymes.
b. it is normally turned off if glucose is present.
c. lactose binds to the repressor protein and inactivates it.
d. it is an inducible system.
e. the structural genes make products that allow lactose metabolism.
6) interleukins are
a. proteins produced by virus-infected cells that stimulate an immune response.
b. molecules produced by white blood cells that stimulate other white blood cells,
namely t cells.
c. chemicals that enhance all lymphatic organs.
d. proteins produced by plasma cells that stimulate the clotting of blood.
7) which type of junctions will create a solid barrier to prevent molecules from moving
between the cells?
a. gap
b. desmosomes
c. tight
d. plasmodesmata
incorrect
8) if a person has a diet high in saturated fats, _____ molecules can carry cholesterol
from the liver to cells and to the arterial walls, whereas _____ transports cholesterol
from the cells to the liver, where it is converted to bile salts which can lead to an
increased risk of cardiovascular disease.
a. ldl; hdl
b. hdl; trans-fats
c. ldl; insulin
d. hdl; ldl
9) which of the following is an example of active transport through a cell membrane?
a. movement of carbon dioxide out of the blood stream and into the lungs
b. movement of oxygen from the lungs into the bloodstream
c. movement of sweat onto the surface of your skin
d. absorption of glucose from the gut into the bloodstream
incorrect
10) you are interested in the effect of increased carbon dioxide versus normal air, and
also in the effect of green light versus full sunlight on the growth of corn plants in a
greenhouse. although you can set up your experiment inside a greenhouse, it is possible
that there will be plant growth effects due to effects that you do not know and may
never know. which of the following are important to ensure control of unknown
variables?
a. an increase in carbon dioxide does not result in a substantial decrease of other
necessary gases.
b. all seedlings are from one uniform strain.
c. the intensity or brightness of the green light equals the intensity of the full sunlight.
d. all temperatures and available water remain the same.
e. all of the choices are important.