Which of the following is essential for development of discrete, isolated colonies?
What will be an ideal response?
solid medium
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Why does it take more than a week before a mosquito just infected with yellow fever virus can transmit the disease?
A. The virus must replicate in the gut of the mosquito before it can reach high enough numbers for transmission to a new human. B. Mosquitoes only feed once a week, which limits their ability to transmit the disease rapidly. C. Yellow fever is caused by a protozoan. It must develop from the sporozoite form into the mature form to become infectious, and this takes time. D. The virus multiplies in the gut of the mosquito, but then needs to migrate to the proboscis (biting nose) of the animal in order to infect a new human being after a new bite. This migration takes time
Weak selection against the dominant phenotype
a. reduces the equilibrium frequency of the dominant genotypes b. completely eliminates the dominant genotypes c. has no effect on the dominant genotypes
Which of the following statements about steroid hormones is NOT true?
A. The hormone-receptor complex can bind to chromatin. B. Estrogen is a steroid hormone. C. Steroid hormones act faster than non-steroid (peptide) hormones. D. The hormone-receptor complex can enter the nucleus. E. Steroid hormones do not bind to cell surface receptors.
Which of the following statements pertaining to changes in the global economy of the 21st century is true?
A) Barriers to the free flow of goods, services, and capital have increased B) volume of global output has been growing more rapidly than cross-border trade and investment C) National economies are becoming more independent D) the world is moving toward an economic system that is more favorable for international business