In E. coli, the genetic material is composed of ________
A) circular, double-stranded RNA
B) circular, double-stranded DNA
C) polypeptide chains
D) RNA and protein
E) linear, double-stranded DNA
Answer: B
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Two sea urchin proteins were named cyclin A and B because, during the embryonic cell cycle, they were periodically
a. activated and inactivated by phosphorylation and dephosphorylation. b. synthesized and degraded. c. bound and released by another protein. d. ubiquitylated and non-ubiquitylated.
Who is credited with first observing microorganisms?
A) Robert Hooke B) Anton van Leeuwenhoek C) Robert Koch D) Louis Pasteur E) Carolus Linnaeus
Lichens are a mutualistic association of a fungus and either an alga or a cyanobacterium in which
A) the fungus protects the photosynthetic partner from erosion. B) the fungus slowly engulfs the photosynthetic partner. C) the fungus helps collect sunlight for the photosynthetic partner. D) the phototroph provides phosphorus to the fungus.
Taste buds are
a. really just modified sensilla. b. found only on the tongue. c. collections of papilla that each respond to different stimuli. d. small capsules of cells, each with a pore at the top though which sensory hairs project and interact with environmental molecules. e. EACH able to respond to sweet, sour, salty, bitter, and savory (umami) stimuli.