Which of the following multicellular organisms were among the first to evolve light-sensing photoreceptive organs?
A. fish
B. amphibians
C. cyanobacteria
D. cnidarians and flatworms
D
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Through which plant structure does the majority of water evaporate?
a. Root nodules b. Stoma c. Leaves d. Stroma e. Root hairs
__________ and __________ are single-celled heterotrophs with a secreted shell. Fill in the blank(s) with the appropriate word(s)
Water is important to the interactions of
biological molecules because it a. promotes hydrophobic and hydrophilic interactions. b. stabilizes temperature. c. is an excellent solvent for polar and ionic substances. d. has strong cohesive properties. e. does all of these.
Which of the following components is/are found in the cell walls of gram-positive bacteria but NOT gram-negative bacteria?
A. Cytoplasmic membrane B. Lipopolysaccharide C. Outer membrane D. Peptidoglycan E. Teichoic acid