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What of the following best defines a notochord?
A. A component that eventually develops into the spinal cord
B. A length of cartilage
extending along the body, which will become part of the spinal discs.
C. That which will become the pharynx, gills, or other feeding system in the
animal.
D. A muscular tail extending behind the anus.
E. A groove located in the underside of the pharynx that produces mucus in
filter-feeding species
B
A species of desert plant secretes a chemical into the
surrounding soil that kills seeds from any other species of plant that attempts
to germinate in that area. What is this an example of?
A. Commensalism
B. Allelopathy
C. Exploitation competition
D. Apparent competition
E. Intraspecific competition
B
A scientist wants to detach a peripheral membrane protein
from the exterior of a cell membrane. Which is the best method to do so?
A. change the salt
concentrations
B. perform a light centrifuge
C. add a detergent
D. Change the temperature of the solution
E. Run a small current through the solution
A
All of the following hormones are derived from cholesterol
EXCEPT one. Which one is the EXCEPTION?
A. Aldosterone
B. Cortisol
C. Epinephrine
D. Testosterone
E. Progesterone
C
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