Which of the following statements about oxygen is false?
A. Oxygen is the only potential electron
acceptor available on Earth's surface.
B. Only the oxidation of organic molecules by
O2 provides sufficient energy to support
large, active organisms.
C. Oxygen concentrations in the atmosphere
favor diffusion into the interior cells of
organisms.
D. Oxygen is necessary for complex
multicellular life.
E. Oxygen became abundant in the
atmosphere 580-560 million years ago.
A
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The troph of the motile T. vaginalis organism measures 7 to 23 m long and 5 to 15 m wide. The recommended treatment of choice for this urogenital infection is:
a. tetracycline. b. metronidazole. c. penicillin. d. ketoconazole.
Males more commonly are affected by Xlinked
recessive genetic disorders than are females because
a. females have two X chromosomes and thus less of a chance to be recessive. b. males have only one X and thus more of a chance to be recessive. c. males have only one X, they have multiple alleles for each gene. d. Y chromosomes cause X gene mutations. e. males are weaker genetically than females
During the early phase of the ovarian cycle, which ovarian hormone is at the highest levels?
a. GnRH b. estrogen c. progesterone d. FSH e. hCG
A relationship between two species in which both species benefit is called ________
Fill in the blank(s) with correct word