Land plants are thought to be most closely related to the ____
a. chlorophyte algae
b. red algae
c. charophyte algae
d. brown algae
e. euglenoids
ANSWER: c
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Complement-mediated lysis is achieved by
A. entry of lysozyme into Gram-positive bacteria and entry of lysozyme into Gram-negative bacteria. B. entry of lysozyme into Gram-negative bacteria. C. entry of lysozyme into Gram-positive bacteria. D. None of the choices are correct.
The net direction that an ion or molecule
moves is
a. dependent upon the size of the molecule. b. unpredictable because the movement is random. c. the result of concentration differences. d. controlled by the temperature of the medium. e. controlled by the membranes in the vicinity.
In general, microbial growth in the open ocean is most limited by the availability of ________.
A. iron B. manganese C. phosphorus D. nitrogen
Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?
A) auxin and phytochrome B) auxin and Pfr C) Pfr and phytochrome D) cytokinins and phototropins