Identify and describe:A
three different ways in which leaves can be arranged on stems, and list one example for each.
B.
three different venation patterns in leaves and whether each is characteristic of eudicots or
monocots What will be an ideal response?
A. 1) alternate arrangement: one leaf per node, e.g., beech
2) opposite arrangement: two leaves per node, e.g., maple
3) whorled arrangement: three or more leaves per node, e.g., catalpa
B. 1) parallel venation: primary veins run parallel to each other; monocots
2) pinnately netted: major veins branching off a midvein; eudicots
3) palmately netted: major veins radiating from one point; eudicots
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The term biome refers to
a. the animals present in a given area. b. the interaction of living organisms and the physical environment in a region. c. large regions with distinctive plant communities. d. all the living organisms in an area. e. only the bacteria in a region.
Maxillae are used to bite and grind food
____________________ Indicate whether the statement is true or false.
If a strain of bacteria had a mutation that blocked expression of the lac repressor, what would you expect as a result?
A. The mutant strain would outcompete wildype strains, since it could always utilize lactose. B. The mutant strain would act the same, because it would still require lac activator protein to turn on. C. The mutant strain would waste energy producing enzymes in the absence of lactose. D. The mutant strain would grow at the same rate as wildtype if lactose was not present.
From the late 1950s to the mid-1960s, numerous experiments using in vitro cell-free systems provided information on the nature of the genetic code. Briefly explain how the use of polynucleotide phosphorylase and the triplet binding assay were used to
decipher the genetic code and why the triplet binding assay was more precise. What will be an ideal response?