A student in a histology class was asked to describe the structure of a stratified squamous epithelium. Which one of the following is the best description?
A) tissue composed of protein fibers in a ground substance and a few cells
B) tissue composed of one layer of flat cells located on a basement membrane
C) tissue composed of contracting protein fibers enclosed by plasma membranes
D) tissue composed of several layers of tall cells resting on a basement membrane
E) tissue composed of several layers of flat cells resting on a basement membrane
E
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Vegetation is usually more dense and vigorous on the windward side of mountains than on the leeward side
Indicate whether the statement is true or false
The offspring of two heterozygous gray-bodied, normal-winged flies should be 50% gray-bodied/normal wings
(BbRr) and 50% black-bodied/vestigial wings (bbrr) because these alleles are linked. Suppose a small number, say 15%, of the offspring are instead black-bodied with normal wings. This is most likely the result of: a. crossing-over. b. incomplete dominance. c. codominance. d. an error in meiosis.
e. mutationWhich statement about human reproduction is correct?
A) Fertilization occurs in the uterus. B) In humans, spermatogenesis and oogenesis function best at normal, core body temperatures. C) A human oocyte completes meiosis after a sperm penetrates it. D) The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules.
In the event that you are modeling weekly advertising spend (as a dependent variable), and you notice that several weeks have no spending-it is likely your analysis will have to handle what?
A. A selected sample problem B. A limited dependent variable C. An endogeneity problem D. A small sample problem