"Sticky ends" are:a
the single-stranded ends of a DNA segment created by some restriction enzymes.
b. a problem in recombinant DNA technology because they form loops of single-stranded DNA.
c. double-stranded ends of a DNA segment created by some restriction enzymes.
d. sites of the origin of replication in prokaryotes.
e. sugar molecules that are bound to the ends of a DNA fragment.
a
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A saprobe differs from a parasite in that
A. a saprobe has the ability to undergo meiosis to produce sexual spores, but a parasite can only perform mitosis to produce asexual spores. B. a saprobe has a pseudohyphae morphology, but a parasite has true hyphae. C. a saprobe derives nutrients from dead plants and animals, but a parasite derives nutrients from living plants and animals. D. a saprobe is a fungus, but a parasite is a protozoan.
The correct microbiological term for the sample of specimen that is put into a nutrient medium to produce a culture is ________.
A. streak B. colony C. loop D. inoculum
The accumulation of free oxygen in the atmosphere
a. was a result of the accumulation of a by-product of a type of photosynthesis. b. prevented the further spontaneous generation of life. c. provided the opportunity to extract more energy through aerobic respiration. d. did not occur immediately after the earth was formed. e. did all of these.
Which of the following metabolic pathways is found only in prokaryotes?
A. Embden-Meyerhof-Parnas (EMP) B. Entner-Doudoroff (ED) C. Pentose phosphate pathway D. Non-cyclic photophosphorylation E. Calvin-Benson