The cuticle of a leaf is composed of
a. waxes.
b. pectin.
c. cellulose.
d. cutin.
e. all of these.
Answer: e
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In a human female, which of the following would be inhibited by an inhibition of LH?
a. maturation of follicles b. secretion of estrogen c. secretion of FSH d. secretion of GnRH
In the Gulf of Mexico dead zone, oxygen levels in lower water levels are low because ____.
a. phytoplankton consume vast quantities of oxygen without producing any oxygen b. the runoff into the dead zone is contaminated with high densities of bacteria that consume oxygen c. of the Great Lakes d. pollutants in runoff, especially fertilizers, lead to phytoplankton growth and the dead phytoplankton are consumed by bacteria that use up oxygen e. the runoff into the dead zone is already extremely low in oxygen and mixes with the water already present in the Gulf of Mexico
Which organelle has enzymes to digest molecules in the cell:
a. vacuoles b. chloroplast c. mitochondria d. lysosomes
When using vectors to produce proteins for gene therapy, what are some of the problems that may occur and how has medical science overcome these problems?
A. cDNA produced by vectors active an immune response, tags are therefore added to help the body identify them as self. B. Proteins injected using vectors get degraded too quickly and therefore protective segments have been added to the proteins. C. Virus vectors used may actually cause disease and therefore medical technicians have removed those segments. D. RNA added via vectors to a human may cause a toxic response and so a buffer is added to the vector.