The partly decayed organic portion of soil is called:a
silt.
b. clay.
c. sand.
d. humus.
e. castings.
d
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Let P = purple flowers and p = white, and T = tall plants and t = dwarf. Of the 16 possible gamete combinations in the dihybrid cross between 2 double heterozygotes, how many would produce the phenotype white, tall?
A. none B. 1 C. 3 D. 9 E. 16 Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about dihybrid crosses? How does it relate to the question? 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?
A key influence of the atrioventricular node on the heartbeat is to
A. speed up the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. B. slow down the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. C. act as a barrier that prevents the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. D. not alter the speed at which the electrical impulse to contract passes from the atria to the ventricles. E. block backflow of blood from the aorta into the right ventricle.
Signals from the parasympathetic nervous system would cause a(n):
a. widening of pupils b. increase in pulse rate c. increase in digestive system movements d. rise in blood sugar level e. rise in metabolic rate
You have isolated a prokaryotic cell. The first step in identification is a(n)
A) Gram stain. B) lactose fermentation test. C) endospore stain. D) flagella stain. E) DNA fingerprint.