A prokaryotic cell may possess each of the following cellular components EXCEPT
A) flagella.
B) a nucleus.
C) ribosomes.
D) a cell wall.
E) a cell membrane.
B
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Answer the following statements true (T) or false (F)
1. The fossil record shows that angiosperms evolved directly from the Gnetophytes. 2. Incomplete flowers can be perfect flowers but imperfect flowers cannot be complete flowers. 3. Stamens and carpals are, in fact, modified sporangia-bearing leaves. 4. Horizontal gene transfer is restricted to prokaryotes and protists. 5. Secondary metabolites can be used to distinguish between different species of plants.
A species' biotic potential is intrinsically determined by all of the following EXCEPT which one?
A) the number of members of reproductive age B) the number of offspring produced by each reproducing member C) the time span before offspring reach reproductive maturity D) the ratio of males to females E) the presence of competing species in the same habitat
Which of the following is generally accepted as the origin of living organisms?
a. Life was seeded on Earth from some distant place by meteorites and comets crashing into Earth. b. Spontaneous generation c. Life originated from an oxygen-rich atmosphere on Earth. d. Life can originate from nonliving matter. e. Prebiotic chemical evolution gave rise to progressively more complex molecules and eventually to living organisms
Which of the following statements is an accurate combination of postulates 1 and 2 of natural selection?
A. Environmental variation exists for traits among individuals in a population. B. Heritable variation does not exist among individuals in a population. C. Heritable variation exists for traits among individuals in a population. D. Drug resistance exists among all individuals in a population.