The ability to determine an object's location using high frequency sound waves is exhibited by
_____ amphibians underwater.
_____ bats flying in darkness.
_____ whales and dolphins at sea.
_____ owls hunting at night.
_____ amphibians underwater.
__X__ bats flying in darkness.
__X__ whales and dolphins at sea.
_____ owls hunting at night.
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Species of the genus Hyphomicrobium are budding bacteria that attach to solid objects and are ________.
A. aerobic chemoheterotrophs B. able to reproduce by budding C. found in marine and freshwater environments D. All of the choices are correct.
What is the purpose of safranin in the Gram stain technique?
a. It is a counterstain, which will make gram-positive bacteria colorless. b. It is a decolorizing agent. c. It is the primary stain used to impart a pink color to all cells in a heat-fixed smear. d. It is a counterstain, which turns gram-negative bacteria pink.
Which of the following is not true about archaeal ribosomes?
A. Differences in rRNA nucleotide sequences led to the division of the prokaryotes into two separate taxa. B. They may possess ribosome binding sites homologous to bacterial Shine-Dalgarno sequences. C. They have similar antibiotic sensitivities to those of bacteria. D. They are 70S like bacterial ribosomes.
Closure of the internal nares is a transition seen in going from fish to mammal
a. true b. false