The imaging technique that identifies differences in blood flow to particular regions through detection of differences in the relative proportions of oxygenated and deoxygenated hemoglobin is the
A. X-ray.
B. MRI scan.
C. sonogram.
D. fMRI scan.
E. CT scan.
Answer: D
You might also like to view...
Which of the following regarding the Spemann organizer is true? (Check all that apply.)
_____ Signaling molecules from the organizer inhibit ventral development. _____ The dorsal lip cells directly activate dorsal development. _____ The organizer determines the dorsal-ventral axis. _____ The organizer forms in the area of the grey crescent. _____ The point of sperm entry determines the orientation of the organizer.
In Leber's disease (LHON), degeneration of the optic nerve results in blindness due to a defect in NADH dehydrogenase affecting electron transport
If this is due to a mutation in a mitochondrial gene, which combination of the following effects would you expect to see when doing a pedigree analysis of a family with LHON? i. variable expressivity ii. incomplete penetrance iii. progressive blindness over time iv. maternal inheritance v. diminished muscle mass A) i and ii only B) ii and iii only C) iii and iv only D) i, ii, iii, and v only E) i, ii, iii, and iv only
Which of the following hormones promotes cell division?
A) auxin B) cytokinin C) gibberellin D) abscisic acid
What makes phospholipids good at forming cellular membranes?
A. the polar and nonpolar regions create an amphipathic bilayer of phospholipids B. the three saturated fatty tails in phospholipids create a semisolid like structure that maintains a cell's shape C. regions of aliphatic and hydrophilic atoms causing an internalization of phosphorous making a bilayer D. covalent and ionic bonds between glycerols create a tight seal around the cell