Why does conjugation with an Hfr donor result in a much higher rate of gene transfer than conjugation with an F+ donor?
A) An F+ donor makes fewer pili.
B) An F+ donor's T strand is slow to reach the pilus.
C) The Hfr donor transfers genes from the chromosome and not the plasmid.
D) The Hfr donor segment must undergo recombination in the recipient.
E) The F+ donor segment must undergo recombination in the recipient.
C
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Which of the following would likely fossilize under normal environmental conditions?
A. An elephant that died near a waterhole that dried up. B. A bird that died and fell into the forest litter. C. A slug that died in leaf litter. D. A soft shelled crab that dies in an estuary. E. Both a bird and slug that die and fall in leaf litter.
A paraphyletic group contains
A. a common ancestor but not all of its descendants. B. groups of species with different common ancestors. C. a common ancestor and all of its descendants. D. a common ancestor and all of its descendants but not the most recent common ancestor. E. every species ever derived from a common ancestor.
In fungi, food materials are digested:
a. within food vacuoles b. outside the body c. intracellularly d. by the mitochondria e. by the host organism
The genetic code is expressed differently in bacterial and archaeal cells than in eukaryotic cells.
Answer the following statement true (T) or false (F)