What evidence supports the idea that some nuclei are totipotent?
a. Nuclei taken from the cells of an embryonic frog can direct an egg to develop into a
tadpole.
b. Nuclei taken from the cells of a frog embryo can direct an egg to develop into a tadpole.
c. Nuclei taken from a different species can direct a tadpole egg to develop into a normal
tadpole.
d. Some cells are capable of undergoing unlimited cell cycles.
e. Some cells are capable of arresting their cell cycle at will.
A
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If a DNA template strand has a sequence of 3? TACAATGTAGCC 5?, then the RNA produced from it will be which sequence?
A. 3?TACAATGTAGCC5? B. 5?ATGTTACATCGG3? C. 5?AUGUUACAUCGG3' D. 3?AUGUUACAUCGG5? E. 3?ATGTTACATCGG5?
Marine bony fish __________ water by osmosis, while freshwater bony fish __________ water by osmosis. Fill in the blank(s) with the appropriate word(s)
Water is an example of a(n)
a. atom. b. ion. c. compound. d. mixture. e. element.
Which of the following statements about cells is true?
A) All cells have cell walls. B) All cells have internal structures that move. C) All cells are attached to other cells. D) All cells are motile.