Which of the following is NOT a step that ultimately leads to antibody production?
a. Activation of helper T cells by dendritic cells
b. Differentiation of plasma cells
c. Activation of cytotoxic T cells by helper T cells
d. Immature B cells conducting surveillance for foreign epitopes
Answer: c. Activation of cytotoxic T cells by helper T cells
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Why does ice float in liquid water?
A) The high surface tension of liquid water keeps the ice on top. B) The ionic bonds between the molecules in ice prevent the ice from sinking. C) Ice always has air bubbles that keep it afloat. D) Stable hydrogen bonds keep water molecules of ice farther apart than water molecules of liquid water. E) The crystalline lattice of ice causes it to be denser than liquid water.
The body's core temperature is about
a. 98.6?C b. 37?C c. 37?F d. 75?F e. 50?C
The comparison between the number of human genes and those of other animal species has led to many conclusions, including that _____
A) the density of the human genome is far higher than in most other animals B) the number of proteins expressed by the human genome is far more than the number of its genes C) most human DNA consists of genes for protein, tRNA, rRNA, and miRNA D) the genomes of most other organisms are significantly smaller than the human genome
Choose the one most appropriate answer for each.
A. Taiga B. Seamounts C. Savanna D. Littoral zone E. Benthic province F. Tropical rain forest G. Hydrothermal vent H. Alpine tundra I. Estuaries J. Biome