The following statements regarding penicillin production and applications are true EXCEPT
A) Penicillin is a secondary metabolite produced by a filamentous fungus.
B) Penicillin derivatives can be produced by biosynthetic or semisynthetic methods.
C) Natural penicillin (penicillin G) inhibits a wide spectrum of bacteria.
D) Penicillin selection method is used to enrich the auxotrophic mutations.
E) -lactamases, which cause penicillin resistance, are easily transferable when they are located on plasmids.
Answer: C) Natural penicillin (penicillin G) inhibits a wide spectrum of bacteria.
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Indicate whether the statement is true or false
Calico cats are female. The patches of fur color result from X inactivation, silencing fur color genes on one X chromosome or the other. However, extremely rarely, there can be a male calico. Describe the genetics necessary for a male calico cat.
A. XX with a translocation of the SRY gene onto one of the X chromosomes. B. XY with a mutation in the SRY gene. C. XX with a translocation of the testosterone gene onto one of the X chromosomes. D. XY with a mutation in the estrogen gene. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about calico cats? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Climate can best be described as
A. how hot or cold a location is based on its altitude. B. the average weather patterns in a given area over long periods of time. C. how hot or cold a location is based on its distance from the equator. D. the temperature and rainfall of a specific area over the course of a year.
Provide a brief description of the variable gene activity hypothesis as it relates to development. What information is often provided in support of this hypothesis?
What will be an ideal response?