Which of the following statements is true about moss and fern reproduction?
A. Both mosses and ferns require wind for
gamete dispersal.
B. Mosses require water for fertilization, but
ferns do not.
C. Both mosses and ferns have a dominant
gametophyte generation.
D. Both mosses and ferns produce their
spores in diploid sporangia.
E. Both mosses and ferns have a dependent
sporophyte generation.
D
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This figure compares an intertidal habitat before and after an oil spill. Which one of the following organisms appears to persist after the spill?
1.fish
2.mollusks
3.echinoderms
4.barnacles
Which term suggests that we often confuse what is with what one ought to do? For example, stealing resources from other members of the same species is common. It is natural but not condonable.
A. B. C. D. Naturalistic Fallacy E.
Cystic fibrosis is a genetic disease that results from a defective CFTR protein that alters ion flow through the cell membrane such that water does not cross the cell membrane. Gene therapy is being used to attempt to help cystic fibrosis patients. Which
of the following steps is not needed to develop a gene therapy treatment for cystic fibrosis? A) Clone the normal-functioning CFTR gene and make an RNA version of the gene. B) Make antibodies to the defective CFTR protein to enhance the patient's immune system. C) Remove cells from a patient and infect them with the recombinant virus. D) Insert the RNA version of the CFTR gene into a virus.
While on a backpacking trip in Maine, Julie and her friends obtained their drinking water from several different pristine streams, adding one or two drops of bleach to ensure its safety. Several days later Julie began experiencing abdominal distress, specifically cramping, fatty diarrhea, and flatulence. When it didn't clear up within several days, Julie visited her doctor. Which of the following would be the most likely cause of Julie's symptoms?
A. E. coli O157:H7 B. Giardia intestinalis C. Toxoplasma gondii D. Entamoeba histolytica E. Schistosoma mansoni