In plants, what name is given to a region where mitosis occurs most frequently?
What will be an ideal response?
Meristem
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The body fluid of sharks has a much lower concentration of sodium chloride than that of the surrounding seawater, and yet they are able to remain in osmotic equilibrium with the external environment. How can this be the case?
A. Sharks store enough urea in their bloodstream to match the total solute concentration of the surrounding seawater. B. Sharks are osmoregulators. C. Sharks maintain high levels of sodium chloride in their skin. D. Sharks drink large volumes of seawater to compensate for the low salt concentration of their body fluids. E. None of the answer options is correct.
Calculate the number of copies that would be produced from a single starting molecule after 10 rounds of PCR
What will be an ideal response?
Why is a species that has few individuals at greater risk of extinction than a species with a large population size?
A) A species with few individuals is more likely to be eliminated by a reduction in population size caused by a chance environmental event like bad weather or a fire. B) There's no risk to a small population as long as genetic diversity is high. C) A species with few individuals is likely to have a high percentage of heterozygotes. This can reduce the likelihood that the species can adaptively evolve in response to environmental changes. D) Genetic drift allows small populations to avoid the loss of advantageous alleles from the population.
Transporters, in contrast to channels, work by ________________
(a) specific binding to solutes. (b) a gating mechanism. (c) filtering solutes by charge. (d) filtering solutes by size.