If organs are analogous to the body, which of the following are organelles analogous to?
a. an eukaryote
b. a prokaryote
c. a cell
d. an animal
Ans: c. a cell
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Your colleague is studying a newly discovered organism. She is becoming increasingly convinced that the organism is an arthropod. You find that you must respectfully disagree when you note that the organism has a set of distinctly nonarthropod characteristics. The features that cause you to exclude the organism from the arthropod grouping are
A. jointed legs, ecdysis, and an exoskeleton. B. antennae, six legs, and mandibles. C. compound eyes, book lungs, and a hemocoel. D. Malpighian tubules, ommatidia, and tagmata. E. pseudocoel, closed circulatory system, and ventral heart.
Which of the following statements best explains why microbial geneticists initially focused on regulation of gene expression at the transcriptional, rather than the translational, level?
A. Cellular regulation of transcription is common to all prokaryotic cells. B. The process of transcription was best understood by researchers at the time. C. The process of synthesizing an mRNA transcript is much less complex than translation of mRNA into protein. D. By regulating the first step of protein synthesis, cells conserve the greatest amount of energy.
When a chromosome undergoes a deletion mutation, information is
a. reversed b. repeated c. transferred d. lost
By definition, an indirect parasitic life cycle includes:
A. a parasite that can infect more than one host b. A parasite that has more tha one stage.morphologic form during its life C. a parasite that must infect two different species of hosts to complete its life cycle D. A parasite that has an environmentally resistant stage as well as infection in the host