In the process of nitrogen fixation, if you start with 5 molecules of N2, you will need _____ hydrogen atoms and _____ ATP molecules to make _____ molecules of ammonia.
A. 15; 16; 5
B. 15; 80; 10
C. 30; 80; 10
D. 30; 80; 5
C. 30; 80; 10
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Which of the following shows an F1 monohybrid cross?
a. RrMM ? Rrmm b. RRMM ? rrmm c. Rr ? Rr d. rr ? RR e. Rr ? rr
In addition to eutrophication in lakes, which process is being caused by excess nutrients in rivers?
A. warming of the water in the Gulf of Mexico B. introduction of exotic species like Zebra mussels C. the dead zone in the Gulf of Mexico D. decreased plant growth E. clogging of city water lines
The skeletal and circulatory systems are produced by
a. the ectoderm. b. the endoderm. c. the mesoderm. d. two of the germ layers. e. all of the germ layers.
Which of the following pairs is incorrectly matched?
A. cytotoxic T cell; class I MHC protein B. B cell; class I MHC protein C. helper T cell; CD4 D. B cell; IL-2 secretion E. macrophage; class II MHC protein