Soil mineral particles that range from 0.02?0.002 mm in diameter are called
a. sand.
b. humus.
c. clay.
d. silt.
e. macro/microparticles.
D
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An endotoxin is
A) the toxic portion of the LPS. B) a toxin produced within archaeal cells. C) a toxin known for its primary attack on the epidermis of mammals. D) a toxin produced in the periplasm of most bacteria.
Consider the cladogram shown. Based on this cladogram, which species has the greatest number of ancestral character states (pleisiomorphies)?
A. 1
B. 2
C. 3
D. 4
E. 5
F. 6
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain and what do they mean?
Gather Content
· What do you already know about cladistics?
Consider Possibilities
· What other information is related to the question? Which information is most useful?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In pea plants, the allele for round peas (R) is dominant to the allele for wrinkled peas (r). A gardener has a plant that his neighbor gave him that produces round peas, but he does not know its genotype. What simple procedure could he do to determine the genotype of his new plant?
a. Perform a dihybrid cross—if only 1 out of 16 offspring are wrinkled, then the new plant’s genotype is RR. b. Perform a test cross with a plant that has wrinkled peas—if any offspring give wrinkled peas, then the new plant’s genotype is Rr. c. Perform a test cross with a plant that has an Rr genotype—if all of the offspring give round seeds, then the new plant’s genotype is Rr. d. Perform a monohybrid cross—if any offspring give round peas, then the new plant’s genotype is RR.
A prokaryote that occupies a habitat that is characterized by extreme heat (above 50 degrees Celsius) is a(an):
a. Thermophile b. Acidophile c. Halophile d. Basophile e. Hydrophile