Salmonella, Shigella, Yersinia, and Serratia are all
A) pathogens.
B) gram-negative facultatively anaerobic rods.
C) gram-positive aerobic cocci.
D) fermentative.
E) endospore-forming bacteria.
B
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Most cells spend the majority of their lives in _____
a. prophase b. metaphase c. anaphase d. telophase e. interphase f. prophase and anaphase
Lichens are
a. parasitic interactions between a fungus and an alga. b. only found growing on living matter. c. symbiotic associations between a fungus and an alga. d. capable of causing some obscure diseases. e. insensitive to changes in the environment.
Mutations can be
a. random. b. beneficial. c. harmful. d. heritable. e. all of these
In a certain plant species, thick-shelled seeds are caused by the dominant allele T. Thin-shelled seeds are caused by the recessive allele t. What is the genotype of an individual with thin-shelled seeds?
A) TT B) tt C) Tt D) tt or Tt