(a) What is a tumor-suppressor gene?
(b) What are oncogenes?
(c) What is the normal (nonmutant) cellular version of an oncogene called?
What will be an ideal response?
(a) A tumor-suppressor gene is a gene whose normal function is to suppress cell division. When mutant, cell division control is lost and a cancer may form.
(b) Oncogenes are genes that induce or maintain uncontrolled cellular proliferation associated with cancer.
(c)The normal cellular version of an oncogene is called a proto-oncogene.
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The American redstart (Setophagaruticilla) is in serious decline. Scientists have been able to correlate health and breeding success to levels of 13C in their blood (a chemical signature indicating the source of their diet). Birds with lower levels of 13C in their blood return to their spring breeding ground sooner, weigh more and produce more offspring. Based on this, what would you expect to find in the wintering grounds of the American redstart? Check all that apply.
_____ Limited availability of habitat in areas where plants have low13C. _____ Higher insect biomass in areas where plants have low13C. _____ A lack of territorial behavior being displayed by American redstarts. _____ Differences in food quality correlating with levels of 13C in the habitat. _____ Similar flora and fauna in all redstart habitats, unrelated to levels of 13C. 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 habitat loss and songbirds? 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?
Why isn't the endometrium shed during a pregnancy?
What will be an ideal response?
Which of the following species was rescued from the brink of extinction?
A) passenger pigeon B) California condor C) Nile perch D) Steller's sea cow E) great auk
Which list is arranged from the smallest to the largest organization level?
a. tissue, organ, organ system b. tissue, organ system, organ c. organ system, organ, tissue d. organ system, tissue, organ e. organ, organ system, tissue