Which factor currently tends to regulate abundance of commercially valuable estuary species such as oysters and crabs?

a. Competition
b. Predation
c. Human activities
d. Normal seasonal die off
e. Disease


C

Biology & Microbiology

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A protein region with a specific function and structure is called a

A) conserved site. B) domain. C) locale. D) motif.

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A pesticide targets the endodermal layer in developing mosquitoes. Based on this, which of

the following will likely not develop correctly?

a. muscles b. gut c. outer exoskeleton d. reproductive system

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Kidney stones____

a. are four times more likely to occur in men than women b. usually cause extreme pain c. cause no pain when they enter the ureter d. are formed when proteins that are dissolved in the urine concentrate e. never block the flow of urine

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Some of the stages of meiosis are listed below. For the following statements, select the best choice of these stages.

A. Pairing of homologues occurs during this stage. B. New genetic combinations are present after this stage. C. Recombination via crossing over occurs during this stage. D. E. During this phase, homologues separate. F. During this stage, the sister chromatids begin to separate. G. By the end of this phase, a nuclear envelope forms around each set of haploid chromosomes. H. Following this phase, each individual cell is haploid.

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