In temperate lakes, the surface water is replenished with nutrients during turnovers that occur in the _____
A) autumn and spring
B) autumn and winter
C) spring and summer
D) summer and winter
E) summer and autumn
Answer: A
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In a muscle contraction, the Z lines of a
sarcomere are ___.
a. closer together but not overlapping b. further apart c. the same distance as when not contracting d. thicker e. overlapping
The famous skeleton named Lucy belong to which species?
a. Homo erectus b. Homo habilis c. Australopithecus afarensis d. Homo floresiensis e. Neanderthals
You have developed an antibiotic that inhibits a bacterial enzyme critical for the formation of the cell wall. However, after only a short time, the bacteria become resistant to the antibiotic, and it's no longer effective
Which mechanism is responsible for the bacteria no longer being sensitive to your antibiotic? A) Over time, your antibiotic selected for bacteria containing a gene that codes for an enzyme capable of metabolizing your antibiotic. B) The bacteria learned to avoid taking up the antibiotic in their surroundings. C) The immune system of bacteria recognized the antibiotic as being foreign and quickly removed any antibiotic before it could accumulate to toxic levels. D) Through the use of plasmids, bacteria communicated with other bacteria that a noxious chemical was present in the environment.
As global temperatures continue to rise, what is a likely outcome?
A) loss of populations of polar fish species B) greater overharvesting of medicinal plant species C) less greenhouse gas emissions D) formation of new glaciers