Bacteriophages are viruses that ____
a. catalyze bacterial reproduction
b. attach to bacterial cells and extract bacterial DNA
c. interfere with DNA replication in the cytoplasm of cells
d. produce histones
e. infect and copy themselves inside bacterial cells
e
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Suppose you are carrying out a series of crosses with an insect where the mechanism of sex determination is unknown. You discover a mutant female with short bristles and decide to cross it with a wild type male that has normal bristles. Half of the F1 progeny have short bristles but all of these short-bristled F1 progeny are males. Based on these results, a valid hypothesis would be
A. Males are ZW, females are ZZ, and short bristles are caused by a dominant allele on the Z chromosome. B. Males are ZZ, females are ZW, and short bristles are caused by a recessive allele on the Z chromosome. C. Males are ZZ, females are ZW, and short bristles are caused by a dominant allele on the W chromosome. D. Males are ZZ, females are ZW, and short bristles are caused by a dominant allele on the Z chromosome. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about sex determination systems? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
In a cell membrane, the phospholipid heads are ____
a. hydrophobic b. nonpolar c. dissolved in the cell’s watery interior d. sandwiched between the phospholipid tails e. formed by fatty acids
What species concept is used by paleontologists as they compare the physical characteristics of fossils to understand human evolution?
What will be an ideal response?
Three populations of crickets look very similar, but the males have courtship songs that sound different. What function would this difference in song likely serve if the populations came in contact?
A) a temporal reproductive isolating mechanism B) a postzygotic isolating mechanism C) a behavioral reproductive isolating mechanism D) a gametic reproductive isolating mechanism