What is a defining feature of chordate embryos?
a. cephalization
b. a nerve cord
c. ganglia
d. a brain
e. a dorsal nerve cord
e
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Procedures such as grinding, mincing, vortexing, and preparing smears:
a. are hazardous and should be performed while wearing gloves and gown protec-tion. b. create aerosol droplets and should be per-formed only in an approved biosafety cabinet. c. should be avoided with specimens known to contain infectious agents. d. produce a spill hazard and should be per-formed over an absorptive mat.
We can calculate whether a reaction is spontaneous by calculating the change in free energy and accounting for
entropy. Your paycheck always lists your gross pay, net (take home) pay, and tax withholdings. Which of the following best correlates your paycheck to the changes in free energy?
a. gross salary = net salary - tax; total energy = free energy - entropy b. net salary = gross salary - tax; free energy = total energy - entropy c. tax = gross - net salary; entropy = total energy - free energy d. gross salary = tax - net salary; total energy = entropy - free energy e. net salary = gross salary + tax; free energy = total energy + entropy
Which sentence best describes what occurs during bacterial transformation?
a. Bacteria take up pieces of DNA through infection of a virus. b. Bacteria replicate DNA molecules. c. Bacteria make replicate copies of one another. d. Bacteria take up pieces of DNA that are released as other cells disintegrate.
For a physical map of a chromosome, distances are measured in units of:
A. centiMorgans. B. contigs. C. map units. D. RFLPs. E. base pairs.