Four of the five responses listed below are
characteristic reactions of the complement system to
invaders. Select the exception.
a. causes an amplifying cascade of reactions to
invaders
b. triggers the secretion of histamines
c. causes invading cells to lyse
d. enhances the recognition of invaders by
phagocytes
e. creates gradients that attract phagocytes
Answer: b
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Genetic testing is typically done with blood samples, yet red blood cells (erythrocytes) are anucleate (lack nuclei) and are thus devoid of DNA. How, then, are these tests done?
What will be an ideal response?
In the embryonic development of flowering plants, the basal cell develops into the:a
apical cell. b. apical meristem. c. suspensor. d. integuments. e. endosperm
Which abiotic factor in the illustration would limit the carrying capacity of this environment for fresh water snails in the pond?
A) number of plants growing along the pond's banks B) population of birds C) concentration of algae in the upper levels of the pond D) amount of sunlight reaching the pond
All of the RNAs
A. are translated into proteins. B. can be found in the ribosomes. C. are transcribed from DNA. D. interact with amino acids. E. function within the nucleus.