The zig-zag and solenoid models are associated with the _______ level of DNA organization
A. histone
B. 11nm fiber
C. beads-on-a-string
D. 30 nm fiber
E. scaffold protein
D
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It is possible to make a form of nitrogen that is useable by plants; however, the major drawback to this process is:
A. time involved. B. getting enough nitrogen. C. cost of converting nitrogen to a useable form. D. temperatures must be extremely high. E. it is difficult to contain the end product.
Which adaptation is found among the majority of desert plants?
a. A period of dormancy b. Flowering only at night c. They deter predators d. A quick growing cycle e. Reduced water loss
Which of the following is not a characteristic of an autosomal recessive disorder pedigree?
A. Affected children can have unaffected parents. B. Both males and females are affected with equal frequency. C. Two affected parents will always have affected children. D. Affected individuals with homozygous unaffected mates will have unaffected children. E. Heterozygotes have an affected phenotype.
Which of the following best reflects what we know about how the flu virus moves between species?
A) The flu virus in a pig is mutated and replicated in alternate arrangements so that humans who eat the pig products can be infected. B) A flu virus from a human epidemic or pandemic infects birds; the birds replicate the virus differently and then pass it back to humans. C) An influenza virus gains new sequences of DNA from another virus, such as a herpesvirus; this enables it to be transmitted to a human host. D) An animal such as a pig is infected with more than one virus, genetic recombination occurs, the new virus mutates, the virus is passed to a new species such as a bird, and the virus mutates again and can now be transmitted to humans.