Which organism can often be transmitted by the bite of a domestic animal and causes sepsis?
a) Yersinia pestis
b) Borrelia burgdorferi
c) Pasteurella multocida
d) Bacillus anthracis
Ans: c) Pasteurella multocida
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Select all of the following that are bryozoans and brachiophytes characteristics.
_____ tentacles that are useful in breathing and feeding. _____ U-shaped digestive tract. _____ lack a coelom. _____ parthenogenesis.
Which of the following principles is NOT part of Darwin's theory of evolution by natural selection?
A. Evolution is a gradual process that occurs over long periods of time B. Variation occurs among individuals in a population C. Mutations are the ultimate source of genetic variation D. More individuals are born than will survive E. Individuals that possess the most favorable variations have the best chance of reproducing
What are the main roles of testosterone in males?
a. Stimulates spermatogenesis b. Formation of external genitalia c. Development of secondary sex characteristics d. All of the above
The MyoD transcriptional regulator is normally found in differentiating muscle cells and participates in the transcription of genes that produce muscle-specific proteins, such as those needed in contractile tissue
Amazingly, expression of MyoD in fibroblasts causes these cells derived from skin connective tissue to produce proteins normally only seen in muscles. However, some other cell types do not transcribe muscle-specific genes when MyoD is expressed in them. Which of the following statements below is the best explanation of why MyoD can cause fibroblasts to express muscle-specific genes? (a) Unlike some other cell types, fibroblasts have not lost the muscle-specific genes from their genome. (b) The muscle-specific genes must be in heterochromatin in fibroblasts. (c) During their developmental history, fibroblasts have accumulated some transcriptional regulators in common with differentiating muscle cells. (d) The presence of MyoD is sufficient to activate the transcription of muscle-specific genes in all cell types.