Which enzyme joins the paired sticky ends of DNA fragments?
A. Reverse transcriptase
B. Restriction enzyme
C. DNA ligase
D. DNA polymerase
E. Polynucleotide kinase
Answer: C
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Why is it not surprising that Staphylococci are the leading cause of wound infections?
A. This genus is readily present as a part of the normal microbiota on most people's skin, so it could easily enter wounds. B. Members of this genus are all particularly virulent and highly capable of causing numerous infections. C. Staphylococci cannot be eradicated from the skin due to multidrug resistance in most members of the genus. Drugs simply don't kill them. D. Staphylococci are capable of a higher degree of spontaneous mutation than most microbes. This makes them able to acquire antibiotic resistance very readily, making them hard to eliminate by pre-surgical antibacterial scrubs. As such, they commonly infect surgical wound sites.
Summarize the arguments both for and against irradiating foods. What will be an ideal response?
Cyanobacteria are a type of
A) chemoautotroph. B) chemoheterotroph. C) photoautotroph. D) photoheterotroph.
Which is an example of a clumped distribution of a population?
A. A tree species releases a poison to defend the soil around its roots, resulting in trees spaced evenly like a grid. B. Multiple species join each other at the waterhole to drink. C. Antelope travel in herds. D. Two male hummingbirds have a confrontation on the border between their territories.