Who were the first hominins thought to wear clothing, build fires, and live in caves or shelters?
a. Homo habilis
b. Homo sapiens
c. Homo erectus
d. Homo eragaster
e. Homo neanderthalensis
c
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Which of the following is likely to be chemically unreactive?
a. chlorine (7 valence electrons) b. calcium (2 valence electrons) c. argon (8 valence electrons) d. carbon (4 valence electrons) e. potassium (1 valence electron)
The term gymnosperm literally means
A. naked ovule. B. clothed ovule. C. naked seed. D. clothed sperm. E. clothed seed.
Chemoautotrophs oxidize which of the following to obtain the energy necessary to reduce carbon dioxide to an organic compound?
A. ammonia B. hydrogen sulfide C. hydrogen gas D. nitrites E. All of the above.
MRSA is the acronym for methicillin-resistant Staphylococcus aureus. Many of the strains of the common bacterium are also resistant to other antibiotics in use today. The resistance is linked to a collection of genes carried on plasmids that are passed from one bacterium to another by conjugation. Suppose a newly discovered, chemically different antibiotic is used in place of methicillin. Which of the following would be the most likely effect on Staphylococcus aureus antibiotic resistance?
(A) The gene for methicillin resistance, no longer needed, would disappear entirely from Staphylococcus aureus populations within a few generations. (B) Transmission of the methicillin-resistance plasmid by conjugation would increase among the Staphylococcus aureus population as the genes would confer resistance to the new antibiotic. (C) Transmission of the methicillin-resistance plasmid would gradually decrease but the plasmid would not entirely disappear from the Staphylococcus aureus population. (D) Transmission of the methicillin-resistance plasmid by conjugation would increase among the Staphylococcus aureus population due to destruction of bacteria without the plasmid through use of the new antibiotic.