Who first confirmed that the replication of DNA was semiconservative?
a. Chargaff and Hershey
b. Watson and Crick
c. Avery and Griffith
d. Meselson and Stahl
e. Watson, Crick, and Wilkins
d
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You have a sequence of DNA with a site on which the restriction enzyme EcoRI will act. EcoRI recognizes the sequence below and cuts each strand at the locations indicated by the arrows. A section of normal DNA is shown here
The SNP shown below the normal allele is associated with a higher risk of developing high blood pressure (hypertension). You amplify a cardiology patient's DNA and digest it with EcoRI (Question 15.3.2 shows where EcoRI acts). Which lane in the gel below represents a sample from an individual heterozygous for this SNP? Normal allele: 5' ATTCGCGGAATTCTGG 3' 3' TAAGCGCCTTAAGACC 5' Allele associated with hypertension: 5'ATTCGCGGGATTCTGG 3' 3'TAAGCGCCCTAAGACC 5' What will be an ideal response?
With its claw removed, the male fiddler crab will be unable to mate; the claw is needed to ________
a. restrain the female while mating b. obtain prey to provide to the female c. confront predators who otherwise would attack the defenseless females d. attract females, who select males on the basis of claw size
Inflammation
a. is triggered by activated complement. b. is a non-specific, local response. c. results in redness due to increased blood flow. d. results in swelling due to diffusion of water into the tissue. e. is true of all of these
The repeating units of muscle contraction are called myofibrils
____________________ Indicate whether the statement is true or false.