Eukaryotic cells have their DNA enclosed in
the
a. plasma membrane.
b. nucleus.
c. nucleoid.
d. nucleolus.
e. nucleotide
B
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Production of enterotoxin is a characteristic of ________.
A) Clostridium botulinum B) Clostridium perfringens C) Clostridium difficile D) Clostridium tetani E) All of the choices are correct.
Which of these would a paleontologist most likely do to determine if a fossil represents a reptile or a mammal?
A) Look for the presence of milk-producing glands. B) Look for the mammalian characteristics of a four-chambered heart and a diaphragm. C) Use molecular analysis to look for the protein keratin. D) Examine the teeth.
Sites within the DNA that gain extensively more than the number of mutations expected from a random distribution are called __________
a. point mutations b. hotspots c. suppression d. silent mutations e. transition
Mitochondrial DNA profiling is used to trace the maternal side of family trees. Why is this done using mtDNA?
A) The mtDNA under low selective pressure mutates readily. B) The mtDNA undergoes recombination allowing allelic mixture. C) The mtDNA is supplied to the zygote only from the egg. D) The mtDNA only comes from the father so all differences are from the mother.