The function of telomeres can be best described as:
A. attachment sites for the proteins of the kinetochore.
B. sequences at the ends of the linear eukaryotic chromosome that protect the ends from proteases.
C. sequences of the eukaryotic chromosome that ensure proper distribution during mitosis.
D. sequences of the bacterial chromosome that ensure proper distribution during binary fission.
E. the sites at which replication initiates.
B
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Viruses may cause cancer in these three typical ways:
_____ Some viruses encode an oncogene in their genome. _____ A viral genome may integrate into the host chromosome, disrupting a cell cycle gene. _____ Some viral proteins interact with cell cycle regulatory proteins. _____ Viral infection provides large amounts of nutrients, encouraging the cell to divide and proliferate. _____ All viruses promote host cell proliferation, as a way to spread more virus. _____ Cell proliferation is an adaptive response of the host to any viral infection, to outgrow the virus. _____ When a DNAvirus brings extra DNA into the host cell, that signals that S phase is complete. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the link between viruses and cancer? 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?
Bacteroids are ____
a. specialized nitrifying bacteria b. small buds from ammonifying bacteria c. specialized bacteria that help some plant roots absorb phosphorus d. enlarged and immobilized nitrogen-fixing bacteria e. interactions between plant root hairs and bacteria
A particular haploid strain of yeast contains a temperature-sensitive mutation in its cdc2 gene resulting in no functional Cdc2 protein at the nonpermissive temperature
At the nonpermissive temperature, each of the following events would fail to occur at the appropriate cell cycle stage except A) replication of DNA. B) fragmentation of the nuclear envelope. C) condensation of chromosomes. D) appearance of the mitotic spindle. E) prevention of fusion of chromosome ends.
Which of the following organisms grow on higher plants to produce truffles?
A) euglenids B) kinetoplastids C) mycorrhizae D) lichens E) water molds