Which primary producer listed below is considered the most abundant life form in the sea?
a. Dunaliella
b. Synechoccus
c. Methanococcus
d. Pryolobus
e. Prochlorococcus
E
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A pollen tube together with its contents of male gametes constitutes the ____
a. male reproductive organ b. endosperm mother cell c. mature male sporophyte d. immature male gametophyte e. mature male gametophyte
The accompanying figure is a micrograph of what kind of tissue?
a. cardiac muscle b. skeletal muscle c. nerve tissue d. cartilage e. dense connective
During interphase of the cell cycle, ________
A) the nuclear membrane disappears B) sister chromatids move to opposite poles C) DNA content essentially doubles D) DNA recombines E) RNA replicates
________ are heterotrophic protists; ________ are photoautotrophic protists
A) Mixotrophs; protozoans B) Protozoans; algae C) Protozoans; plants D) Parasites; protozoans