The exit of an endospore causes the cell to
a. burst open
b. return to dormancy
c. lyse
d. regenerate
a. burst open
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In prokaryotes, repressor proteins: (Select all correct choices)
A. bind with DNA and prevent transcription. B. bind with activators and prevent transcription. C. are part of the mechanism of positive regulation. D. are part of the mechanism of negative regulation.
Answer the following statements true (T) or false (F)
1. Tiktaalik is an important fossil for the understanding of phylogeny because it is an intermediate form between fish and amphibians. 2. The formation of feathers, hair, and reptilian scales is based on completely different developmental patterns and genetic influences. 3. The first truly bipedal primates were the australopithecines. 4. Our species, Homo sapiens, had been in existence for approximately 1,40,000 years when it moved out of Africa and replaced Homo neanderthalis, another species of human, about 30,000 years ago.
Inhalation of respiratory secretions is involved in the transmission of all of the following except ________.
A. legionella B. influenza C. SARS D. diphtheria E. rhinitis
The most commonly reported STI in the United States is ________.
A. gonorrhea B. syphilis C. HIV infection D. Chlamydia infection E. genital herpes