Which of the following is NOT accurate regarding the Bicoid protein?
A. it is a morphogen
B. it is a transcription factor
C. it activates genes when it reaches a concentration threshold
D. if affects the posterior part of the Drosophila embryo
E. it activates gap genes
D. if affects the posterior part of the Drosophila embryo
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Why do the veins of the legs require valves in order to function?
What will be an ideal response?
Blood tests can provide information on blood chemistry in order to determine if the organs of the body are functioning correctly. Which of the following test results would be least likely to cause the suspicion of cancer?
A. negative findings of CA 15.3 (none is present in the blood) B. a drastic increase in calcium levels in the body C. presence of specific cancer antibodies D. elevated levels of CA 125 protein E. elevated liver enzyme levels
Positive assortative mating in a population will:a
produces more mutations each generation. b. causes natural selection. c. changes allele frequencies. d. stabilizes genotype frequencies. e. increases homozygosity.
Hair is a character shared by all mammals, but not found in their ancestral lineage. Hair is therefore considered to be a(n)
A. shared derived character (trait). B. analogous structure. C. clade. D. shared ancestral character (trait).