A scientist Investigated DNA replication in two groups of cells, labeled A and B. She Injected radioactively labeled nucleotides Into cells of each
group and allowed DNA replication to begin. When replication was halfway completed, she Injected a drug into the cells to stop replication. She
then examined the cells to determine the distribution of the newly-synthestzed DNA. She found each cell of group A had many segments of new
DNA In Its nucleus, while each cell of group B had a single segment of new DNA in Its cytoplasm.
What can the researcher conclude about the cells?
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Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?
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Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.
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Which of the following is the smallest unit that would contain a complete copy of the entire human genome? a) one human somatic cell b) one human chromosome c) all of the dna of one human d) one human gene
Answers: 2
A scientist Investigated DNA replication in two groups of cells, labeled A and B. She Injected radio...
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