Human use of ecosystems
A. is in harmony with natural ecosystems.
B. increases the number of animals present.
C. requires the alteration of previously existing ecosystems.
D. does not occur.
C. requires the alteration of previously existing ecosystems.
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Which of the following couplets DOES NOT give the correct kinds of insects contained in the Order?
A. Coleoptera: beetles B. Lepidoptera: grasshoppers C. Diptera: flies D. Hemiptera: bugs E. Hymenoptera: ants, bees, and wasps
In eukaryotes, what modification occurs to the
mRNA transcript?
a. the non-coding segments are removed b. the thymines are removed and replaced with uracils c. cytosines are added to the ends of the transcripts d. coding segments are methylated e. more than one of these modifications occur
Which of the following statements about lipid bilayers is FALSE?
a. They are self-sealing. b. They are inflexible. c. They spontaneously form closed vesicles. d. They can fuse with other bilayers. e. They resist forming free ends
If you looked at unknown cells under a microscope, what could lead you to correctly conclude that they are prokaryotic cells?
A) They appear to have a cell wall. B) They lack a nucleus. C) They are oblong in shape. D) They form a colony.