Bacteria that are unable to survive in the presence of oxygen are called
A) obligate anaerobes.
B) obligate aerobes.
C) facultative anaerobes.
Answer: A
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Connell studied two barnacle species, Balanus balanoides and Chthamalus stellatus. Where these species coexist,
____.
a. the realized niche of Balanus is smaller than its fundamental niche due to competition by Chthamalus b. the realized niche of Balanus is larger than its fundamental niche due to competition by Chthamalus c. the realized niche of Chthamalus is smaller than its fundamental niche due to competition by Balanus d. Balanus' fundamental niche includes all of Chthamalus fundamental niche e. the realized niche of Balanus is about equal to its fundamental niche
Parental care of the young is usually associated with species with a Type ___ survivorship curve.
A. I B. II C. III D. I or II (depending on the sex ratio) E. I or III (depending on whether the reproductive strategy is iteroparous or semelparous)
What distinguishes facilitated diffusion from simple diffusion?
a. Molecules move from a region of lower concentration to a region of higher concentration. b. Membrane proteins help move molecules across the membrane. c. No energy is used to move molecules across the membrane. d. Molecules move from a region of higher concentration to a region of lower concentration.
Small, random genetic changes that occur over generations is known as ________.
A. progenesis B. microgenesis C. anagenesis D. degenesis