Looking out your window, you may notice that the bark of a nearby oak tree has a mosaic appearance, consisting of deep fissures and relatively flat areas. What accounts for this mosaic appearance? Select all correct choices
A. the formation of new cork cambia as old
cork cambia grow away from the phloem
B. the formation of new secondary phloem in
distinct, discontinuous patches
C. the formation of new cork cambia in
distinct, discontinuous patches
D. the formation of new vascular cambia as
old cork cambia grow away from the phloem
A,C
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A researcher is attempting to determine the prevalence of asymptomatic human infection with West Nile virus in New York City. Which of the following would be most useful?
A. Detection of IgG against WNV B. Viral culture in embryonated eggs C. Detection of IgM against WNV D. Tissue culture E. Electron microscopy
Which glands regulate blood calcium levels and can number between two and six copies of the gland in any given individual?
a. thalamus b. pituitary c. parathyroid d. adrenal
An individual is exposed to a pathogen and takes five days to recover. When exposed a year later they
again take five days to recover. Would you suspect that adaptive immunity was involved? What will be an ideal response?
The probability of producing a normal child by two
parents who are carriers for an autosomal recessive disorder is a. 0%. b. 25%. c. 50%. d. 75%. e. 100%.