In the male reproductive system, the vas deferens is connected to the urethra by a short tube called the
____________________. Fill in the blank(s) with the appropriate word(s).
ANS: ejaculatory duct
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Nucleosomes are best described as
a. prokaryotic DNA associated with nonhistone proteins. b. eukaryotic DNA associated with histone proteins. c. prokaryotic DNA associated with histone proteins. d. eukaryotic DNA associated with nonhistone proteins. e. associated histone and nonhistone proteins
Analogous structures form because:
a. they are forms of mutation. b. they evolve as a response to similar environmental pressures. c. they only occur as errors. d. they share a similar genetic origin.
Your text describes an experiment in which low-nutrient conditions select bacteria that would kill off other bacteria
When nutrients became plentiful again, these killer bacteria became less common because they had lower fitness in this environment, but they didn't become extinct. Why would some of the killer bacteria survive in the new environment? A) They're waiting for a future time when that trait may be useful again. B) They have changed the killer gene to a less costly one but can regenerate the killer gene when necessary. C) Competition must be low enough that the disadvantage of having the killer trait isn't great enough to cause extinction. D) The killer trait is a dominant trait, so it cannot be eliminated.
Which of the below is not one of the basic pathways through which people are exposed to radiation
a. inhalation b. absorption c. ingestion d. direct