Endospores can be inactivated by
A. incineration.
B. dry heat at 170°C for 2 hours.
C. glutaraldehyde for 3 or more hours.
D. ethylene oxide for 3 or more hours.
E. All of the choices are correct.
Answer: E
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Both Echinodermata and Chordata fall under the supergroup Deuterostomia. What primitive gut tube structure defines the Deuterostomes?
a. embryonic mesoderm b. enterocoelom c. archenteron d. blastocoel
Microorganisms and cellular debris are removed from lymph by the ________ and from blood by the ________
Fill in the blank(s) with correct word
A plant feeding insect species colonizes two different hosts, I and II, in the same habitat
Host preference is determined by a single locus, (A), and the ability to detoxify plant defensive compounds is determined by a second unlinked locus, (B). Genotypes A/A, and A/a prefer host I, whereas genotype a/a prefers host II. Genotypes B/B and B/b can detoxify compounds from host I but not II, whereas b/b can detoxify the com-pounds of host II but not of host I. Why may sexual reproduction come with a cost in this system? a. The offspring of A/A;B/B individuals mating with a/a;b/b will suffer fitness consequences on host I. b. A cross of A/a;B/b x A/a;B/b will produce A/A;b/b offspring. c. Any mating of an A/a;B/B individual with a partner sharing the same host preference will result in offspring that is maladapted to either host. d. A mating of an A/a;B/B individual with a partner sharing the same host preference can result in offspring that is maladapted to either host.
Confocal microscopes, in combination with specialized computer software, can be used to create three-dimensional images of cell structures.
Answer the following statement true (T) or false (F)