Despite viruses require a living host's metabolism to replicate, it remains unclear whether viruses existed before living cells

Indicate whether the statement is true or false.


Answer: TRUE

Biology & Microbiology

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The structures labeled "5" are

a. trichocysts. b. micronuclei. c. flagella. d. pili. e. gullet.

Biology & Microbiology

What is the main function of the ozone layer?

a. to provide cloud cover for protection of polar regions b. to provide a source of oxygen for photosynthesis c. to filter toxins from acid rain d. to block most of the sun's damaging rays from reaching Earth e. to trap carbon dioxide and warm the planet

Biology & Microbiology

The abbreviation DNA stands for ________

Fill in the blank(s) with correct word

Biology & Microbiology

Five species of ants can be found on aspen sunflowers (Helianthella quinquenervis), which live in wet mountain meadows of the Rocky Mountains. The aspen sunflowers provide nectar to the ants in special structures called extrafloral nectaries

The ants, in turn, protect the sunflowers from other insects. The ants, however, are not found solely on the sunflowers—they can be found tending aphids on other flower species and collecting nectar from other species as well. This, then, is an example of a(n): A. obligate mutualism B. obligate antagonism C. facultative mutualism D. facultative antagonism E. none of the answer options are correct.

Biology & Microbiology