Microbes playing a role in nitrogen fixation in plants live in ________, while those playing a role in the digestive tract of certain herbivores live in ________
A) rumens / nodules
B) nodules / rumens
C) nodules / fortrans
D) fortrans / rumens
Answer: B
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Humans have 23 pairs of chromosomes; how many linkage groups are present in humans?
a. twenty-three—one group for each pair of chromosomes b. forty-six—one group for each chromosome c. two—one with the male gamete, and one with the female gamete d. Because linkage groups are formed when two or more genes are inherited together, the number is nearly infinite.
Most species of ctenophore are:
a. haploid. b. male or female only. c. hermaphroditic. d. asexual. e. none of the above
An important role of burrowing animals is:
a. reducing detritus in the sediment. b. maintaining the structure of marine sediments. c. nutrient cycling. d. circulating water near the bottom.
Methanogens are a type of archaea found in various habitats on the planet, including deep-sea vents in the deepest parts of the ocean. They produce methane gas by reducing carbon dioxide, using hydrogen gas under anaerobic conditions. Given these characteristics, methanogens are a type of _____________________.
A) Chemoheterotroph B) Symbiotic microbe C) Saprobe D) Photoautotroph E) Chemoautotroph