What is an action spectrum?
What will be an ideal response?
Ans: Depicts the relative effectiveness of different wavelengths radiation in driving photosynthesis.
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You begin an experiment with two populations of E. coli that are each composed of 100 cells. The cells are all genetically identical (i.e., they are clones). You grow them up in flasks on a lab bench under identical conditions with unlimited resources
After 10,000 generations, you analyze the genome of each population. Do you expect the genomes of each population to be identical after 10,000 generations? A. Yes, because the starting populations were genetically identical. B. Yes, because resources were unlimited. C. No, because mutations will accumulate independently in each population. D. No, because natural selection was not a factor at any point in this experiment. E. No, because mutation and natural selection (once genetic variation is present) were factors in this experiment.
What causes climate fluctuations described by the Milankovitch cycles?
a. large colonies of oceanic algae b. changes in solar radiation due to sun spots c. minor changes in the Earth’s orbit d. methane emissions from cattle
Which of these is not an adaptation for flight found in most modern day birds?
1.feathers 2.high metabolic rate 3.no urinary bladder 4.three-chambered heart
A(n) exoskeleton is a characteristic of an echinoderm. Indicate whether the statement is true or false