Were there any eukaryotic cells on Earth 1.5 billion years ago?
A. No, they do not appear in the fossil record until around 1 million years ago.
B. Yes, they first appear in the fossil record around 1.8 billion years ago.
C. No, they do not appear in the fossil record until around 500 million years ago.
D. Yes, they first appear in the fossil record around 3.5 billion years ago.
Answer: B
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A dish of cells is treated with centrinone, a centriole inhibitor. These cells would no longer be able to ___.
A. conduct photosynthesis B. synthesize proteins C. make ATP D. produce lysosomes E. divide Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about centrioles? How does it relate to the question? 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?
A new species, ________, was recently shown to have two membranes, like a Gram-negative bacterium, but be phylogenetically related to the Gram-positive family Veillonellaceae.
Fill in the blank(s) with the appropriate word(s).
The replicative form of nucleic acid in filamentous phages is
A. dsDNA. B. dsRNA. C. positive ssRNA. D. negative ssDNA.
When conditions are right, many new species may develop in a relatively short period of time from a single ancestor. Such short bursts of evolutionary activity are called
A) gene flow. B) adaptive radiation. C) the founder effect. D) population explosion. E) genetic drift.