Distinguish between stromatolites and biosignatures
What will be an ideal response?
ANSWER: Fossil stromatolites could be of biological origin and are layers of carbonate or silicate
rock. The biological component is hypothesized to be phototrophic prokaryotes.
Biosignatures are found in sedimentary rock. They are hypothesized to be formed by
cellular activity.
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DNA can be transferred from one bacterial cell to another by ____
a. conjugation only b. transformation only c. conjugation and transformation only d. conjugation and transduction only e. conjugation, transformation, and transduction
A waxy cuticle is secreted by _____
a. ground tissue c. a stoma b. epidermal cells d. root hairs
Regarding seedless fruits, which of the
following is paired incorrectly?
a. seedless grapes--embryos abort b. bananas--natural triploid sterility c. seedless watermelons--induced triploid sterility d. navel oranges--sprouted from corms e. all of these are paired correctly
Which of the following statements accurately describes a role of prokaryotes in chemical recycling?
a. Photoheterotrophs convert atmospheric CO2 into organic compounds. b. Chemoautotrophs such as the soil bacterium Burkholderia glathei increase the availability of nitrogen for growing seedlings. c. Chemoheterotrophic prokaryotes may function as decomposers to return chemical elements to an ecosystem. d. Photoautotrophic bacteria living on hydrothermal vents support communities of eukaryotic species. e. All of the listed responses are correct.