Which class of antibody accounts for the bulk of the circulating antibody?
A. IgA
B. IgD
C. IgG
D. IgE
C
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After water enters a root hair, it passes to the __________ region next
a. cortex b. endodermis c. vascular cylinder d. xylem
Once a pollen tube lands on a compatible stigma
a. chemical cues guide the pollen tube from the stigma to the embryo sac of an ovule. b. that pollen tube continues on to another ovule. c. other pollen tubes are attracted to that ovule. d. other pollen tubes can penetrate that ovule more easily. e. the flower dies to prevent further pollination
When a species expands its niche in response to the removal of a competitor, the species has experienced competitive ________
Fill in the blank(s) with correct word
Which one of the following dissolves blood clots?
a) Streptokinase b) Streptolysin c) Hyaluronidase d) Deoxyribonuclease