X-ray crystallography showed that DNA:a
had the bases in the center of the molecule.
b. had the sugars and phosphates on the outside of the molecule.
c. was a very long molecule.
d. was made of 2 strands.
e. was a helix.
E
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Gene regulation during development is _____, which means that _____
A. restrictive; genes are successively lost over time B. restrictive; genes lose developmental potential over time C. hierarchical; genes expressed at each stage control the expression of genes that act later D. hierarchical; genes are turned on in a specific sequence, starting with totipotent and ending with multipotent E. combinatorial; genes expressed at each stage control the expression of genes that act later
With deindustrialization of the 1960s and 1970s, the U.S. Manufacturing Belt became the Rustbelt
Indicate whether this statement is true or false.
If a child more strongly resembles one parent's physical traits than the other parent's, the explanation could be due to chromosome movements during ________________.
A. anaphase II B. metaphase II C. prophase II D. prophase I E. telophase I
In 1959, doctors began using the powerful antibiotic methicillin to treat infections of
A. Staphylococcus aureus, but within two years, methicillin-resistant strains of S. aureus (MRSA) appeared. How did the resistant strains of S. aureus emerge? Staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. Over time, these resistant individuals became increasingly common. B. In response to treatment of Staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. These bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. Over time, these resistant individuals became increasingly common. C. In response to treatment of Staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.