DNA polymerases from Escherichia coli cannot be used to artificially copy gene sequences with a thermocycler
Indicate whether the statement is true or false.
Answer: TRUE
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The transforming principle described by Griffith in his work with Streptococcus pneumoniae is ____
a. a polysaccharide capsule b. a phospholipid c. protein d. RNA e. DNA
In the United States, most newborns undergo a screening test for up to 60 genetic disorders. A few drops of blood is taken from each baby and the levels of various blood components are determined. The screening identifies babies who might have a genetic disorder, but is not diagnostic. Further testing is required if the screen shows a blood component is out of the normal range. Which of the following technologies could potentially be a low-cost replacement for the current newborn screening and would directly test most babies for the presence of many genetic disorders?
A) PCR to amplify the PKU gene B) exome sequencing and comparison with known mutations in databases C) DNA fingerprinting using CODIS SSRs D) preimplantation genetic diagnosis
Mature human sperm cells
A. are spermatozoa. B. are secondary spermatocytes. C. are oocytes. D. are primary oocytes. E. undergo meiosis.
Before another action potential “spike” can occur
a. there must be a very brief restoration of the resting conditions in the membrane.
b. the membrane voltage must drop to zero.
c. the sodium-potassium pump must cease temporarily.
d. all of the membrane gates must be closed at the same time.
e. all of these must happen.