Which of the following statements is true regarding respiration in fish? Select all correct choices
A. Gas exchange occurs at the alveoli.
B. Gas exchange occurs at the lamellae.
C. Oxygen enters the bloodstream via
countercurrent exchange.
D. Oxygen enters the bloodstream via
crosscurrent exchange.
E. Oxygen moves through spiracles.
F. Oxygen moves through bronchioles.
B,C
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Which of the following statements is true about moss and fern reproduction?
A. Both mosses and ferns require wind for gamete dispersal. B. Mosses require water for fertilization, but ferns do not. C. Both mosses and ferns have a dominant gametophyte generation. D. Both mosses and ferns produce their spores in diploid sporangia. E. Both mosses and ferns have a dependent sporophyte generation.
In Drosophila melanogaster, the allele for red eyes is dominant over the allele for purple eyes, and the allele for a gray
body is dominant over the allele for a black body. A testcross was done to check for genetic linkage between the genes for these traits. The results for the offspring are listed below:478 flies with red eyes and a gray body 27 flies with red eyes and a black body 462 flies with purple eyes and a black body 33 flies with purple eyes and a gray body Which of the choices below best represents the map distance between the genes for these two traits?
a. 50.0 map units b. 30.0 map units c. 47.0 map units d. 27.0 map units e. 6.0 map units
Cervical cancer
a. kills about 3,600 U.S. women each year. b. can affect young women. c. death occurs more often in women who have not had a Pap smear. d. can be caused by genital HPV. e. includes all of these
A biogeochemical cycle involves only the abiotic components of an ecosystem, and describes how chemicals circulate through those components.
Answer the following statement true (T) or false (F)