A mature red blood cell is useful for karyotyping.
Answer the following statement true (T) or false (F)
False
A white blood cell is useful for karyotyping. A mature red blood cell has no nucleus, so it is useless for karyotyping.
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Each thin filament consists of
A) two actin protein strands coiled helically around each other. B) chains of myosin molecules. C) six molecules coiled into a helical structure. D) a rod-shaped structure with "heads" projecting from each end. E) a double strand of myosin molecules.
The thymus is the only lymphoid organ that does not:
A) have lymphocytes B) produce hormones C) have a cortex and medulla D) directly fight antigens
The major pathway of communication between the right and left hemispheres is the
A. longitudinal fissure. B. cerebral sulci. C. hypothalamus. D. corpus callosum. E. cerebral gyri.
The kidney is divided into regions of different tissue, which statement is NOT correct
a) cortical tissue is the outer zone containing the nephrons b) the medulla consists of renal pyramids which empty into the ureters c) cortical tissue extends down between renal pyramids as renal columns d) two to three minor calyces empty into a major calyx