Fats have _________ calories per gram, while carbohydrates and protiens both have __________ calories per gram.
A. 9.3;4.1
B. 4.1;9.3
C.10;5
D.17.6;6.5
Ans: A. 9.3;4.1
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Which of the following statements about invasive species is false?
A. The effect of invasive species on natural communities is always a reduction in diversity. B. Humans are responsible for dramatic increases in the number of invasive species. C. Invasive species often thrive in new areas because they have few natural predators. D. Introduction of invasive species has more devastating effects on islands because of the smaller number of predators and competitors in these systems. E. Invasive species reduce community diversity through displacement, competition, and predation.
Anticodons pair with ________
a. mRNA codons b. DNA codons c. RNA anticodons d. amino acids e. ribosomes
Functional magnetic resonance imaging is used to observe brain function by:
a. examining intracellular second messengers. b. monitoring gene activation. c. examining changes in blood flow to different parts of the brain. d. measuring neurotransmitter-receptor binding effectiveness. e. measuring hormone levels.
Class II MHC genes code for
A. certain secreted complement components. B. all HLA antigens. C. self receptors recognized by natural killer cells. D. receptors located primarily on macrophages, dendritic cells, and B cells. E. All of these choices are correct.