Which group of plants lack true leaves and roots?
A. liverworts, hornworts, and mosses
B. ferns, club mosses, horsetails, and whisk ferns
C. ginkgo, cycads, conifers, and gnetophytes
D. monocots and eudicots
E. All plants lack true leaves and roots.
Answer: A. liverworts, hornworts, and mosses
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You are examining a human pedigree for a trait. You notice that an offspring can be affected even if neither parent is affected. This immediately tells you that the trait is:
A. dominant. B. recessive. C. epistatic. D. produced by multiple alleles. E. incomplete penetrance.
Fire can move, grow, reproduce, use energy, consume oxygen, and interact with its environment. Why is it not alive?
A) It does not have cells. B) It does not consist of complex, well-ordered structures. C) It does not pass on genes for traits to its offspring. D) All of the above are correct.
Chloroplasts contain a green photosynthetic pigment called
A. chlorophyll. B. chromatin. C. hemoglobin. D. keratin. E. Gram stain.
Which of the following devices is used for PCR?
A) an electrophoresis chamber B) a gene gun C) a DNA sequencer D) a thermocycler E) a nucleic acid synthesis machine