Cancer cells are able to enter blood vessels through what is known as ______.
a. closed junctions
b. tight junction
c. open junctions
d. intermediate junctions
Ans: b. tight junction
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Ionizing radiation alters DNA by
A) deleting bases. B) removing nitrogen from the bases. C) breaking the sugar-phosphate backbone. D) reversing replication forks.
A challenge with scientific breakthroughs is that they are rarely accompanied by ________
a. the desire to continue researching them b. the discovery of the tools to study them c. the people interested in them d. the legislation necessary to support them e. the funding to continue the research
At the end of metaphase I, separate
a. homologous chromosomes b. haploid chromatids c. sister chromatids d. centrioles e. germ cells
Carbon source: Different trophic groups
What will be an ideal response?