In some specialized cells of eukaryotes, a very high level of gene expression can be achieved when DNA is copied repeatedly without cell division for example, some insect larvae maximize production of salivary proteins by means of this process:
a. activators binding to enhancers.
b. polytene chromosomes.
c. transport protein binding.
d. expression of micro RNA.
e. post translational modifications.
b
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How do carnivores and herbivores differ?
A. Carnivores can be opportunistic but herbivores cannot. B. Herbivores can be opportunistic but carnivores cannot. C. Carnivores and herbivores require different enzymes to digest their food. D. Carnivores must eat more frequently than herbivores. E. Herbivores remain herbivores at all stages of development, while carnivores are often herbivores in their larval stages.
The following is a representation of a metabolic pathway that involves genes for enzymes A, B, C, and D: A ? B ? C ? D ? product A mutation in the B gene would result in an accumulation of which gene product?
What will be an ideal response?
Why is it so difficult to control or eradicate invasive species?
A. Common herbicides will not kill invasive species. B. Removing invasive species manually is time-consuming and difficult. C. Introducing new predators or diseases can be done without affecting the other living organisms in the area. D. Drying them out or depriving them of oxygen can be done without affecting the other living organisms in the area. E. All of the above make it fairly easy to eradicate invasive species.
The extra amount of air that can be forced into and out of the lung is called the
A. tidal volume. B. residual volume. C. tidal wave. D. vital capacity. E. vital volume.