Blood can be a portal of exit when vascular puncture occurs by either
a. true
b. false
a. true
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Why would the presence of a specific type of keratin, an intermediate filament protein, in the bloodstream or lymph node be an indicator of metastasis of tumor cells?
A. Intermediate filaments are only found in tumor cells. B. Keratin is only present if its specific cell type is also present. C. Intermediate filament proteins cause cells to clump together. D. Answers b and c are both correct.
A plant with a very small tubular type of flower that cannot be pollinated by a large honeybee is exhibiting which
prezygotic isolating mechanism?
a. behavioralb. ecological c. gametic d. mechanical e. temporal
Which of the following statements is false?
a. The development of a coelom was necessary before organisms could develop a large size. b. Segmentation allows increasing specialization of body parts. c. The development of a complete digestive tract allows the specialization of regions to carry out a variety of functions. d. Organisms with radial symmetry developed into the ultimate predators. e. None of these are false.
Surface and aquifer freshwater sources hold what percent of the Earth's total water?
A) 2% B) more than 97% C) 10-12% D) less than 1% E) 20%