To understand past and predict future changes in populations, ecologists use three important factors. These are:
A. the population's birth rate.
B. expected longevity of individuals in the
population.
C. the proportion of individuals in the
population able to reproduce.
D. the population's birth rate and the
expected longevity of individuals in the
population.
E. the population's birth rate, the expected
longevity of individuals in the population, and
the proportion of individuals in the population
able to reproduce.
E
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Would you expect an individual with giardiasis who has diarrhea to be more likely to transmit the disease than an individual with giardiasis who does NOT have diarrhea? Why or why not?
A. No. This illness is spread by respiratory droplets, so diarrhea as a symptom shouldn't matter for transmission of the disease. B. No. This illness is spread by sexual contact, so diarrhea as a symptom shouldn't matter for transmission of the disease. C. Yes. This illness is spread by the fecal-oral route, so presence of diarrhea as a symptom should dramatically increase the possibility of transmission of infection. D. Yes. This illness is spread by insects that feed on contaminated fecal matter, becoming infected themselves. The disease is spread to new individuals when these infected insects bite a susceptible person, transmitting the cysts of the protozoan. As such, diarrhea as a symptom would increase the risk of transmission through biting insects to new individuals. E. No. This illness is spread when people ingest cysts, and a person with severe diarrhea excretes primarily trophozoites; an asymptomatic person is more likely to excrete cysts and is therefore more infectious
Which of the following are classified as pyrimidines?
A) adenine and thymine B) guanine and cytosine C) adenine and guanine D) thymine and cytosine E) adenine and uracil
What is the tendency of a plant's uppermost bud to limit the growth of lower buds? (two words)
What will be an ideal response?
The templates for next-generation sequencing are
A) double-strand restriction fragments. B) double-strand DNA on silicon chips. C) double-strand PCR products. D) single-strand DNA on silicon chips. E) single-strand DNA on slides.