Which of the following is a member of the domain archaea?
a. proteobacteria
b. gram positive bacteria
c. methanogen
d. spirochetes
e. chlamydias
Ans: c. methanogen
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What is a cyclin?
A. a protein that activates kinases B. a protein whose levels change with the cell cycle C. a kinase D. Answers a and b are both correct.
How did the first life on Earth obtain energy?
A. photosynthesis in the presence of oxygen B. photosynthesis in the absence of oxygen C. heterotrophic consumption of organic molecules D. autotrophic consumption of organic molecules E. phototrophic consumption of inorganic molecules
Phylogenetic trees should be viewed as:
a) intellectual exercises, not to be interpreted literally. b) true genealogical relationships of species. c) hypotheses regarding evolutionary relationships of groups of organisms. d) the result of vertical, but never horizontal, gene transfer. e) representations of allopatric speciation events.
MPF activity was discovered when cytoplasm from a Xenopus M-phase cell was injected into Xenopus oocytes, inducing the oocytes to form a mitotic spindle
In a control experiment, Xenopus interphase cytoplasm was injected into oocytes and shown not to induce the formation of a mitotic spindle. Which of the following statements is not a legitimate conclusion from the control experiment? (a) The piercing of the oocyte membrane by a needle is insufficient to cause mitotic spindle formation. (b) An increased volume of cytoplasm is insufficient to cause mitotic spindle formation. (c) Injection of extra RNA molecules is insufficient to cause mitotic spindle formation. (d) Components of an interphase nucleus are insufficient to cause mitotic spindle formation.