You come across a recipe for rhubarb pie. Never having heard of rhubarb, you do a little research. You find out that the part of a rhubarb plant that people eat is the petiole of a large leaf. You purchase some rhubarb for your pie and notice that it contains many long stringy fibers. Based on your knowledge of plant tissues, you know that the stringy fibers are
A. phloem tissue.
B. sclerenchyma tissue.
C. parenchyma tissue.
D. collenchyma tissue.
E. xylem tissue.
Answer: D
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What is "social immunity"?
A. The immunity acquired by disease transmission from nest mate to nest mate. B. The immunity acquired by lining colony nests with antimicrobial secretions. C. The prevention of infection by quick removal of dead and diseased animals from the nest. D. The transfer of infection resistance from immunized to susceptible organisms. E. The immunity acquired by dilution of a pathogen's effectiveness in a large population.
The drug mifepristone (RU-486) is a contraceptive that
a. blocks passage of sperm through the male reproductive tract. b. blocks passage of sperm through the female reproductive tract. c. prevents ovulation. d. causes shedding of the endometrial lining and the implanted embryo by initiating a menstrual period. e. prevents implantation by blocking estrogen receptors in the uterus.
Chromosomes first become visible as two sister chromatids held together at the centromere during which one of the following phases?
A) G1 B) metaphase C) S D) prophase E) anaphase
Refer to the accompanying figure. The structure labeled as 2 is the:a
a. neural plate
b. neural fold
c. notochord
d. somite
e. neural crest