The usefulness of antibiotics is hampered by __________.
a. the emergence of antibiotic-resistant bacteria
b. their inability to kill gram negative bacteria
c. difficulties encountered in mass production
d. the limited types of antibiotic available
e. an antibiotic's lack of specificity for bacterial versus animal cells
Ans: a. the emergence of antibiotic-resistant bacteria
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In what way are monotremes similar to more ancestral chordate lineages, as opposed to more recently evolved mammals?
A) Monotremes lay eggs; other mammals bear live young. B) Monotremes perform little parental care; other mammals use lactation to feed offspring. C) Monotremes do not have jaws; other mammals do. D) Monotremes are ectothermic; other mammals are endothermic. E) Monotremes perform external fertilization; other mammals perform internal fertilization.
Spindle fibers attach to the ____ of a chromosome during cell division
a. centromere b. telomere c. cell membrane d. short arms e. gametes
________ of cytosine bases in mammals causes decreased accessibility of DNA to the transcriptional machinery, resulting in transcriptional repression
Fill in the blank with correct word.
Most microbes need an environment that has a water activity of at least 0.90.
Answer the following statement true (T) or false (F)