Skeletal muscle contraction is largely dependent on calcium ions that enter the cell from:
A. the extracellular space.
B. the sarcoplasmic reticulum.
C. the T tubule.
D. the Z disc.
B
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The equation that describes the relationship between phenotypic variance, genetic variance and environmental variance is
A. VP = VG + VE B. 1 = VG + VE + VP C. VE = VG + VP D. VG = VP + VE
Gene therapy is:
a. replacing all mutant alleles in body cells. b. replacing poor copies of alleles with normal alleles. c. replacing a mutant allele in certain body cells with a normal allele. d. repairing mutant alleles in certain body cells. e. improving gene expression in key body cells.
Recombinant DNA technology is dependent on a particular class of enzymes, known as ________ that cuts DNA at specific nucleotide sequences
A) recombinant DNA technology B) genomes C) restriction enzymes D) vectors E) clones
Which of the following is an incorrect pairing?
A. magnification; refraction of radiation B. contrast; staining techniques C. numerical aperture; curved glass D. dark field: high contrast E. electron beams; shorter wavelength