Clams and other bivalves typically have:
a. dermal gills.
b. gills adapted for trapping food.
c. an operculum.
d. book lungs.
e. swim bladders
b
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Seed plants
a. have alternation of generations. b. are heterosporous. c. develop a seed coat. d. are all of the above.
The phenomenon of microbial antagonism can be explained by
a. certain normal biota directly kill other species by phagocytosis b. normal biota members change the chemical environment making it hostile to other species c. the immune system only recognizes certain species for destruction d. there is limited space for occupation in or on certain areas of the human body
What advantage do individuals with one sickle cell allele have?
a. no advantage b. more rigid red blood cells c. a stronger resistance to malaria d. immunity to typhoid fever
Which of the following statements is correct about passive diffusion?
A) It requires an expenditure of energy by the cell. B) It is a process in which molecules move from a region of higher concentration to a region of lower concentration (or down a concentration gradient). C) It is a process in which molecules move from a region of lower concentration to one of higher concentration (or up a concentration gradient). D) It may require a transport protein. E) It involves movement of molecules down a concentration gradient and may require a transport protein.