Your doctor returns with your lab results and looks grave. "I'm afraid," she says, "you seem to have a problem with your hypophysis." What do you say?
A. "Am I going to need insulin shots?"
B. "Doctor, right now I'm interested in results, not testable ideas about how things work!"
C. "Is it the posterior? Neurological problems run in my family."
D. "Well, that's only responsible for one or two hormones, so it should be easy to treat."
Answer: C
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A theoretical concept that is used to understand how and why certain organisms can be sorted into discrete taxonomic groups is known as the ________.
A. endosymbiotic theory B. genotypic concept C. phylogenetic concept D. species concept
Which special property of Taq polymerases make them useful for PCR?
a. they are stable at high temperatures b. their hydrogen bonds do not break at low pHs c. they multiply quickly d. they are easy to isolate from common fungi e. they paste two DNA fragments together
Which of these observations gives the most support to the endosymbiotic theory for the origin of eukaryotic cells?
A) the existence of structural and molecular differences between the plasma membranes of prokaryotes and the internal membranes of mitochondria and chloroplasts B) the similarity in size between the cytosolic ribosomes of prokaryotes and the ribosomes within mitochondria and chloroplasts C) the size disparity between most prokaryotic cells and most eukaryotic cells D) the observation that some eukaryotic cells lack mitochondria
Most cnidarians are known to produce toxins. In fact, it has been claimed that one particular species produces the most deadly of all toxins on the planet
What feature of this group most likely evolved simultaneously with the evolution of these toxins? A) the medusa body form B) asexual reproduction C) a slow-moving or sessile lifestyle in the adult D) diploblastic design