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?
lane B
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a. Because mRNA is only required in small quantities b. Because transcribing both DNA strands would produce different amino acid sequences c. Because the other strand would produce the same amino acid sequence in reverse order d. Because all genes are located on the same DNA strand, while the other strand acts as protection e. Because the other strand is transcribed directly into amino acids
Receptor potentials are ________ the strength of the stimulus
A) the same regardless of B) unrelated to C) inversely proportional to D) directly proportional to E) much greater than
Since there is a larger concentration of potassium ions inside a neuron, why is the inside of the neuron negative (-70mV) relative to the outside?
A. Potassium ions carry a negative charge. B. Negatively-charged proteins inside the cell counteract the charge of the potassium ions. C. The negative sign is just a historical convention. D. The high concentration of sodium ions outside the cell makes the inside negative by comparison.
The diversity of haploid daughter cells is increased by the independent assortment of chromosomes at anaphase and by
a. crossing over and recombination. b. somatic mutation. c. chromosome elimination. d. the selection of the fittest sperm.