A biologist uses a time machine to collect living material from 2 different time periods. Sample A is 3 billion years old and sample B is 1.5 billion years old. How would these samples differ?
A. Prokaryotic organisms would be abundant in sample A but absent from sample B.
B. Eukaryotic organisms would be present in both samples but much more common in sample B.
C. Prokaryotic organisms would only occur in sample B.
D. Eukaryotic organisms would be absent from sample A.
D. Eukaryotic organisms would be absent from sample A.
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What is the function of histone proteins?
A. organize DNA in eukaryotic chromosomes B. connect chromosomes to the mitotic spindle C. organize the microtubules that make up the spindle D. attach sister chromatids together
If the concentration of a ligand is 100 times greater than the Kd of its receptor, _______ of the receptors will be bound to a ligand.
A. few B. none C. most D. half
The propagation of animals and plants outside their natural habitat is called
A. rehabilitation. B. cloning. C. captive breeding. D. replacement. E. reintroduction.
A duplicate copy of all of the hereditary information contained in the nucleus of eukaryotic cells is made during what stage of the cell cycle?
A. Cytokinesis B. S C. Mitosis D. G1 E. G2