Which cascade is activated when components of the complement pathway recognize and bind to pathogen membranes?
Ans: alternative pathway
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Which of the following statements does NOT describe characteristics of heterospory?
A. Heterospory involves production of spores on two different parts of the same plant. B. Heterospory involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. C. Heterospory increases the chance of cross-fertilization. D. Heterospory increases the potential for genetic variation and aids evolutionary flexibility. E. Heterospory only occurs in vascular plants.
In an example of embryonic induction, signals from cells in the ________ cause gastrulation
a. dorsal lip b. ectoderm c. gray crescent d. endoderm
Using the labels in the accompanying figure, where are chloroplasts found in the greatest density?
a. 1 and 2
b. 3 and 4
c. 4 and 5
d. 6 and 7
e. 7 and 8
IgE antibody, which is associated with allergic responses,
A) encourages mast cells and basophils to release chemicals such as histamine and leukotrienes. B) can be found bound to B cells. C) is resistant to destruction by stomach acid. D) is usually found circulating in the bloodstream. E) is passed from mother to child through breastfeeding and may prevent the development of allergies in the child.