Which stage of development involves initial
cellular reorganization?
a. gamete formation
b. fertilization
c. gastrulation
d. organ formation
e. tissue specialization
C
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Ionizing radiation does NOT include
A) gamma rays. B) UV rays. C) X-rays. D) cosmic rays.
Which extraembryonic membrane produces HCG?
a. yolk sac b. amnion c. chorion d. allantois e. umbilical cord
Two neighboring Caribbean islands harbor iguana populations. One island (island
A) has a total iguana population of 800, while the other (island B) has a population less than half that size, numbering 250. On island A, the frequency of an allele p is estimated at 0.75, while this same allele is present at a frequency of 0.90 on island B. During a hurricane tracking across the islands, a group of about 100 iguanas get rafted from island A to island B. What effect does this have on the frequency of allele p on island B?
A microbiology student sampled a drinking fountain and observed small round colonies growing on his nutrient agar after incubating the plate for 48 hours. He made a slide from one of the colonies growing on the plate. He looked at the slide under the light microscope and noticed that none of the cells had nuclei. Based on this information, what can he determine concerning the colonies growing on his plate?
A) They are bacterial colonies B) They are fungal colonies C) Without staining, there is not enough information to make any determinations