Gene A occurs on chromosome 5, gene B is on
chromosome 21. Therefore, these two portions of the
chromosomes CANNOT be
a. genes.
b. dominant.
c. loci.
d. alleles.
e. recessive.
Answer: d
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The effect of directional growth shown in the
above figure is known to be caused by a. thigmotropism. b. gravitropism. c. abscisic acid. d. salicylic acid. e. all of these.
Select the response that describes a broad-spectrum drug.
A. A drug that is effective against E. coli (Gram-negative) and Staphylococcus aureus (Gram-positive) B. A drug that is effective against Staphylococcus and Streptococcus (Gram-positive) but not Klebsiella (Gram-negative) C. A drug that is effective against Gram-negative organisms D. A drug that is effective against Gram-positive organisms
Muscles differentiate from which tissue?
a. ectoderm b. endoderm c. mesoderm d. gastroderm e. morphogerm
How is the ampicillin a "selectable marker"?
A) It only allows for cells with the ampicillin resistance gene to grow B) It selects which bacteria can transform C) It allows bacteria to transform D) It only allows for cells with the ampicillin resistance gene to glow