Penicillin was considered a "miracle drug" for all of the following reasons EXCEPT
A) it was the first antibiotic.
B) it does not affect eukaryotic cells.
C) it inhibits gram-positive cell wall synthesis.
D) it has selective toxicity.
E) it kills bacteria.
A
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How is karyogamy different from plasmogamy?
A. Karyogamy is the fusion of nuclei, whereas plasmogamy is the fusion of cytoplasm. B. Karyogamy is the fusion of cytoplasm, whereas karyogramy is the fusion of nuclei. C. Karyogamy produces heterokaryotes and plasmogamy produces zygotes. D. Karyogamy produces dikaryotic cells, whereas plasmogamy produces diploid cells. E. Karyogamy involves meiosis, whereas plasmogamy involves mitosis.
For heart muscles to beat in a coordinated rhythm ions must move from one cell to the next through ____.
A. gap junctions B. hemidesmosomes C. focal adhesions D. adherens junctions E. desmosomes
Four of the five organisms listed below are
autotrophs. Select the exception. a. self-nourishing organisms b. organisms whose carbon source is CO2 c. chemosynthetic organisms d. most bacteria e. sulfur bacteria
High levels of what hormone increases the likelihood of fraternal twins?
a. FSH b. LH c. HCG d. progesterone e. estrogen