A DNA chip that contains rows of DNA sequences for mutations that indicate the presence of particular genetic disorders is representative of what type of biotechnology?
A. gel electrophoresis
B. PCR
C. gene pharming
D. DNA microarrays
E. DNA fingerprinting
Answer: D
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The body of a fungus has several characteristics. One of these is their hyphae, long chains of cells. Which of the following statements best describes the nature of septa and cross walls?
A. Septa of the cross walls are formed on the outside of fungal cells and give the fungal body more rigidity. B. Septa form cross walls between the long chains of cells that make up hyphae. C. The cross wall within the nuclear membrane of every fungal body forms septa. D. Spores of fungi that are formed within reproductive structures have cross walls separated by septa. E. Cross walls are responsible for the formation of spindle plaques within the hyphae after the septa are produced.
Which of the following are lines of evidence that support the theory of evolution by natural selection?
A. The comparison of DNA sequences in different organisms B. The comparison of body structures in modern organisms C. The study of the geographic distribution of species on Earth D. All of the above are lines of evidence that support the theory of evolution
The nervous system develops enough to permit reflex actions during which period of development?
A. fetal, months 3-4 B. embryonic, weeks 2-3 C. embryonic, weeks 4-5 D. embryonic, weeks 6-8 E. pre-embryonic
A structure of a flower that can normally be expected to produce male sex cells is the
A. anther. B. petal. C. filament. D. stigma.