Which of the following are NOT substrates for methanogens?
A) acetate and pyruvate
B) carbon dioxide, carbon monoxide, and formate
C) glucose and sucrose
D) methanol, methylamine, and methylmercaptan
Answer: C
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Which of the following statements accurately describes the role of insects in early angiosperm evolution?
A. Insect pollination may have allowed early angiosperms to thrive in the understory habitats of tropical rain forests. B. Insect pollination may have allowed early angiosperms to thrive in the canopy of tropical rain forests. C. Mammal pollination may have contributed to early angiosperm success. D. Very few living members of the earliest angiosperm lineages produce flowers that are visited by insects. E. Insects did not play a significant role in early angiosperm evolution.
The relatively simple excretory system used by flatworms consists of tubules called ____
a. nephrons b. hepatic tubules c. metanephridia d. Malpighian tubules e. protonephridia
Using species names for viruses is controversial since viruses are not considered living organisms, and they change over time so characteristics that may be used for speciation are unstable.
Answer the following statement true (T) or false (F)
The plasma membrane is said to be freely permeable because of the channel proteins.
a. true b. false