Ectothermic animals:a
depend on heat from the external environment to adjust their body temperatures.
b. may dilate blood vessels to increase blood flow and heat to the skin.
c. maintain a relatively constant body temperature despite external temperatures.
d. may have feathers to keep them insulated.
e. may have body fat to keep them insulated.
A
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You decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the semiconservative model of DNA replication is correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?
A. One band of intermediate density. B. One band of intermediate density and one band of light density. C. One band of intermediate density and one band of heavy density. D. One band of heavy density and one band of light density. E. One band of heavy density. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about the Meselson-Stahl experiment? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
When a repressor binds to the operator site on the DNA it normally
A. inhibits the initiation of transcription. B. has no effect on transcription. C. terminates transcription that has already been initiated. D. reduces the rate of transcription.
The life cycle of the Chinese liver fluke goes through which of the following sequences in its life history?
A. adult, shelled embryo, miracidium, cercaria, sporocyst, rediae, metacercaria, adult B. adult, shelled embryo, miracidium, sporocyst, rediae, cercaria, metacercaria, adult C. adult, shelled embryo, miracidium, metacercaria, sporocyst, rediae, cercaria, adult D. adult, miracidium, sporocyst, rediae, cercaria, metacercaria, shelled embryo, adult E. adult, shelled embryo, sporocyst, rediae, cercaria, metacercaria, miracidium, adult
Cells that are produced during mitosis have _____ of chromosomes and are referred to as ____.
a. one set; diploid b. two sets; diploid c. one set; haploid d. two sets; haploid