Class ____ includes mostly extinct species and a few current species such as feather stars and sea lilies
a. Asteroidea
b. Holothuroidea
c. Ophiuroidea
d. Echinoidea
e. Crinoidea
e
Biology & Microbiology
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Plants need which molecules to carry out photosynthesis?
a. H2O only b. CO2 only c. O2 only d. both CO2 and O2 e. both CO2 and H2O
Biology & Microbiology
A very close association with two species is called:
a. adjoining. b. symbiosis. c. predator -prey. d. host-fungus. e. competition.
Biology & Microbiology
Macromolecules that are capable of self-replication are:a
proteins. b. polysaccharides. c. steroids. d. DNA and RNA. e. triglycerides.
Biology & Microbiology
Alpha helices and ?-pleated sheets represent the ________ structure of a protein
A) primary B) secondary C) tertiary D) quaternary E) All of the above
Biology & Microbiology