A positive urease test in cultures from gastric secretions provides preliminary identification of Helicobacter pylori
Indicate whether the statement is true or false
TRUE
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Which of the following defends against BOTH bacteria and viruses?
a. interferons b. lysozyme c. NK cells d. plasma cells e. cytotoxic T cells
Plants do not grow well in soils with a lot of clay
because these soils a. hold onto and do not release water easily. b. are deficient in plant micronutrients and macronutrients. c. tend to absorb too much surface water. d. tend to become compacted and exclude air. e. do none of these.
There are three principal types of bonds that hold multiple atoms together. These are:
a. covalent bonds, ionic bonds, and disulfide bonds. b. hydrogen bonds, ionic bonds, and glycosidic linkages. c. ionic bonds, hydrogen bonds, and ester bonds. d. phosphate bonds, disulfide bonds, and hydrogen bonds. e. covalent bonds, ionic bonds, and hydrogen bonds.
Traits are critical in the study of phylogeny because:
a. A phylogenetic tree is a hypothesis about evolutionary relationships. b. We need to use observation of traits to infer patterns of ancestry and descent among popula-tions. c. By mapping individual traits onto a phylogeny we have already created, we can study the se-quence and timing of evolutionary events. d. B and C. e. A and C.