Which of the following mechanisms make it difficult to classify bacteria into different species groups?
A. vertical evolution.
B. horizontal gene transfer.
C. sexual reproduction.
D. asexual reproduction.
E. low mutation rates.
B. horizontal gene transfer.
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Which of the following is a correct statement about pepsin?
A. It is manufactured by the pancreas. B. It helps stabilize fat-water emulsions. C. It splits maltose into monosaccharides. D. It is activated by the action of HCl on pepsinogen. E. It is denatured and rendered inactive in solutions with low pH.
Which of the following is not a source of genetic variety?
A. crossing over B. synapsis C. random fertilization D. independent assortment
You have two flasks (labeled A and B) that each contain an equal population of normal animal cells. You place flask A in a machine called a shaking incubator, which shakes the flask at 37°C and keeps the cells moving so as to not allow them to adhere to
the bottom of the flask. Flask B is allowed to sit in an incubator (without shaking) at 37°C. If you let the cells in each flask grow for a week, which of the following results are you most likely to observe? A) The cells in flask A will have grown significantly, but the cells in flask B will have not grown at all. B) The cells in both flasks A and B will have grown significantly. C) The cells in both flasks A and B will have not grown at all. D) The cells in flask B will have grown significantly, but the cells in flask A will have not grown at all.
Human infestation with Taenia saginata results from ingesting ________ in undercooked intermediate host
A) scolex B) cysticerci C) proglottids D) eggs E) cysts