When subtropical forest is cleared, which biome is most likely to replace it?
a. grassland suitable for grazing
b. cropland ideal for agriculture
c. young forest with the same species
d. desert with poor, eroded soil
e. chaparral with grass and low bushes
ANSWER: d
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Protobionts are thought to be the first nonliving structures that evolved into living cells. A critical characteristic of a protobiont that is found in both modern day prokaryotes and eukaryotes is
A. internal compartments that subdivide metabolic functions. B. a boundary membrane that separates external from internal environments. C. the ability to exclude all organic substances. D. the ability to fuse with any other protobiont for reproduction. E. the ability to recognize other protobionts for developmental purposes.
Respond to the statements 100–104 with reference to the four
steps of the nitrogen cycles listed below. a. nitrogen fixation b. nitrification c. denitrification d. ammonification M 100. The action of bacteria on nitrogen-containing wastes involves this process. M 101. The action of bacteria on ammonia, ultimately converting it to nitrate, involves this process. E 102. The action of bacteria on nitrates, converting them to gaseous nitrogen, involves this process. E 103. The conversion of gaseous nitrogen first to ammonia and then to other nitrogenous compounds involves this. E 104. The process whereby nitrite is converted to nitrate is an important part of this process.
Which one of the following forms of birth control is effective over the longest period of time?
A) IUD B) hysteroscopy C) cervical cap D) condom E) spermicide
What is caused by the human genetic condition called progeria?
a. muscular and mental deterioration shortly after puberty b. socially inappropriate vocal outbursts and muscular twitches c. premature aging that typically leads to death in the early teenage years d. pattern baldness as early as age 20