Which cell migrates to the thymus gland to mature?
A. T cell
B. mast cell
C. monocyte
D. natural killer cell
E. B cell
Answer: A
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________ is the detection of a sensory signal while ________ is when the brain assigns a meaning to the signal
a. Perception, adaptation b. Sensation, adaptation c. Stimulus, adaptation d. Perception, sensation e. Sensation, perception
Which of the following is not among the first line of defenses against infection?
a. resident bacterial populations d. skin b. tears, saliva, gastric fluid e. complement c. urine flow f. lysozyme
A thin layer chromatogram is useful for
a. measuring the amount of photosynthesis. b. determining the amount of gas produced during photosynthesis. c. separating pigments based on their physical characteristics. d. determining the presence of sugars in a leaf.
Suppose a population of a new plant is found on an island. DNA sequencing determines that this plant shares a limited number of genes with plants on the mainland. Within the species, there is great genetic variability. This would suggest that
A) this plant species has been isolated on the island for a long period of time. B) DNA sequencing is unreliable for determining genetic linkages. C) this new species is more closely related to animals. D) this plant species is very closely related to plants on the mainland.