The opposite results obtained by scientists apparently doing the same experiments in investigating spontaneous generation
A. shows the importance of repeating experiments.
B. shows the importance of exactly duplicating experimental conditions.
C. led to further experiments that ultimately furthered knowledge.
D. All of the choices are correct.
D
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Plant and animal development share a number of features, but differ in major ways as well. Which of the following best summarizes the similarities between the two forms of development?
A) Both plants and animals develop from a process of single fertilization. B) Both plants and animals produce specialized tissues through irreversible processes of determination and differentiation. C) Both plants and animals produce gametes via meiosis followed by mitosis of haploid cells. D) Both plant and animal development depend on precise control of gene expression in time and in space.
Which membrane proteins move specific substances across a membrane, typically by forming a channel?
a. transport b. receptor c. recognition d. adhesion e. enzymes
In order to maintain somewhat constant genetic frequencies, there must be
A. a relatively large population to prevent genetic drift. B. very low migration and mutation rates. C. random mating. D. All of these answers are true.
One sign of yellow fever is that the whites of the eyes and the skin gain a yellowish tint. Given just this information, you can surmise that the cells of which organ are most likely being destroyed?
A) stomach B) liver C) eyes D) pancreas