Wild oysters are diploid and have 20 chromosomes in somatic cells. Scientists have generated tetraploid oysters using colchicine to prevent separation of sister chromatids. Crossing a diploid oyster with a tetraploid oyster resulted in triploid oysters that are commercially advantageous because they are larger and do not have a reproductive phase that usually interrupts the harvesting season. 60) What is x in wild oysters?
A) 5
B) 10
C) 20
D) 40
B) 10
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The refractory period of a neuron plasma membrane is important because
a. it establishes the resting potential. b. it initiates an action potential. c. it ensures that the threshold potential will be reached. d. it ensures that an impulse will travel in a one-way direction. e. in resets the threshold potential.
How does radiometric dating work?
1.Cooling of molten rock produces particular mineral structures that can be used to determine when a crystal formed. 2.Radioisotope decay speeds up over time, so a graph can be made to predict the date. 3.Although ratios of atoms cannot be determined precisely, their half-lives can be used to predict an approximate date that a crystal formed. 4.Fossils older than 60,000 years can only be dated using carbon 14 since all other atoms will have decayed since then.
The formation of carbonic acid in the oceans directly results in
A) increased sea surface temperatures. B) inhibition of shell growth in marine animals. C) increased marine biodiversity. D) increased pH.
Which of the following threats to biodiversity is involved in the majority of the cases?
a. habitat loss b. global climate change c. introduction of exotic species d. overharvesting