The total number of named species is about
A) 160. B) 1.6 billion. C) 160,000. D) 1,600. E) 1.6 million.
E
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Many drugs are produced by placing human genes into bacteria. The bacteria then transcribe and translate these gene into functional human proteins that can then be purified and given as drugs. The fact that this process works is consistent with which hypothesis?
A. Bacteria have evolved to mimic human cells. B. Bacteria cannot divide unless they are inside a host cell. C. Humans and bacteria share a common ancestor. D. Bacteria need to make human proteins to live inside the human body. E. Humans and bacteria use different genetic material.
An example of a density-dependent factor that influences the size of a population is:
a. rainfall. b. temperature. c. a fire. d. parasites. e. an earthquake
What extends from the methylguanosine cap at the start of an mRNA to the AUG initiation codon?
a) the first intron b) the last exon c) the 5' UTR d) the last intron e) the 3' UTR
Phospholipids spontaneously form a bilayer in an aqueous solution. Why do the heads of the phospholipids point out and the tails point toward one another?
A) The tails are nonpolar and form hydrogen bonds with one another. B) The heads are repelled by the water inside and outside the cell. C) The tails are repelled by the aqueous environment, and the heads will directly interact with the aqueous solution.