The height at which green anoles and brown anoles perch in trees overlaps a bit. When brown anoles were introduced to islands inhabited by green anoles, the green anoles evolved a higher number of specialized toe scales in order to perch higher than they previously did when they were the sole species on the island. This is an example of:
A. Interference competition
B. Ecological character displacement
C. Ecological release
D. Escape-and-radiate coevolution
Ans: B. Ecological character displacement
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The parasite that is responsible for causing malaria is called
A. Paramecium. B. Chlamydomonas. C. Plasmodium. D. Entamoeba. E. Giardia.
Which of the following serves as a switching mechanism in the photoperiodic response in plants?
a. phytochrome b. auxin c. cryptochrome d. calmodulin e. phytoalexin
You isolate a crude fraction from the alien cells containing receptors for XFF. You perform a binding assay and plot the XFF receptors occupied (y-axis) at several XFF concentrations
You obtain a Michaelis–Menten-like simple binding curve that indicates a 1 XFF:1 receptor interaction and approaches a maximal level of binding you define as Bmax. From the curve you extrapolate the Kd for XFF binding as the concentration at which 50% of the receptors are bound. What value reflects the affinity of the receptor for the ligand? You have isolated a primary signal factor from the blood of a space alien, which you name XFF (for X-files factor). You also have isolated various types of alien cells which appear to interact with XFF. Based on preliminary data, you think that XFF could be similar to one of three compounds normally found in human blood: epidermal growth factor (EGF), epinephrine, or estrogen. A) Kd B) Bmax C) Kd ? Bmax D) 1/Bmax E) The affinity cannot be determined from the information available.
Mutagens are useful in biotechnology research for
A) producing organisms with altered phenotypes. B) producing new organisms which have beneficial traits from two or more organisms. C) selecting genetic mutants resistant to radioactivity. D) removing undesirable traits from microbes. E) producing DNA fragments for cloning.