Changes in gene action that are often associated with cancer cells are known as ________ changes.
Fill in the blank(s) with the appropriate word(s).
epigenetic
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This summer, you are returning to the research station in Costa Rica to follow up on the population of butterflies you have been studying. You are disappointed to find that there are fewer this year than last. In fact, at dinner your friends studying frogs and birds are complaining about the same thing. What type of influence do you suspect?
A. a density-independent effect like an introduced predator B. a density-dependent effect like environmental disruption C. a density-independent effect like environmental disruption D. a density-dependent effect like an introduced predator 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 factors that affect many different populations of organisms? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection 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?
During the Carboniferous Period, the competitive
edge was held by plants a. with well-developed gametophytes. b. with cuticles. c. with lignin-reinforced tissues. d. with underground stems. e. that produced seeds.
In a series of cotransformation experiments, DNA fragments from x+y+z+ donor bacteria were used to transform xyz recipient bacteria
The following transformation phenotypes were observed in the recipient cells: xy+z xyz+ x+y+z x+yz+ What does this imply about the gene order of x, y, and z?
A death rate of 2.1% would represent 21 deaths per ________ individuals in a population per year
A) 100 B) 1,000 C) 10,000 D) 1,000,000