Explain how you would distinguish a monocot from a eudicot by looking at the anatomy of their roots. What will be an ideal response?
A monocot root differs from a eudicot root in that a monocot root 1) has a central pith (instead of a
solid core of xylem), 2) has alternating bundles of xylem (instead of “xylem arms,”) and phloem, and
3) lacks secondary growth.
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Which of the following models of speciation hinges on a physical barrier which prevents gene flow between populations?
A) dispersive allopatric B) dispersive sympatric C) vicariant allopatric D) vicariant sympatric E) Both A and C.
Electrical signals travel faster down unmyelinated axons than myelinated axons
Indicate whether the statement is true or false
Red-green color blindness is an X-linked recessive trait (dominant allele denoted as C). Two normal-vision parents have a color-blind son. The genotypes of the father, mother, and son are respectively _____,_____,_____.
Fill in the blank(s) with the appropriate word(s).
Rickettsias differ from chlamydias in that rickettsias
A) are gram-negative. B) are intracellular parasites. C) require an arthropod for transmission. D) form elementary bodies. E) are enterics.