Which subunit of RNA polymerase binds the consensus sequences in prokaryotic transcription?
a. ?
b. ?
c. ?
d. ?’
c. ?
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Which statement regarding porphyrin synthesis pathways is CORRECT?
A. The succinyl-CoA/glycine porphyrin pathway is used by all bacteria, photosynthetic eukaryotes, and archaea. B. The porphyrin biosynthetic pathways are unified at the step of 5-aminolevulinic acid. C. The glutamate porphyrin pathway is used by all non-photosynthetic eukaryotes and alpha-proteobacteria. D. There is very little conservation of porphyrin synthesis pathways between eukaryotes, bacteria, and archaea.
Spot desmosomes are actually ________ junctions, which allow for slight flexibility in an epithelium
Fill in the blank(s) with correct word
Graft-versus-host disease results under which conditions?
A) when immunocompetent cells are placed in an immunocompromised host B) when immunodeficient cells are placed in an immunocompetent host C) any time tissue is not exactly matched in a transplant D) only when adult cells are transplanted into a baby
How was disproving spontaneous generation associated with developing principles important to microbiology?
a. Pasteur's experiments with swan-necked flasks supported the concept that microbes in the air were responsible for contaminating nonliving matter. b. Proving spontaneous generation confirmed the existence of microbes. c. Spallanzani disproved spontaneous generation through his experiment, in which flasks of meat broth were boiled and then melted shut, preventing the passage of air altogether. d. Needham disproved spontaneous generation through his experiments, in which boiled flasks of broth, when covered, became cloudy, teeming with microorganisms after a few days.