In relaxed muscle, calcium is found in high concentration in the
A) myofibril.
B) T tubules.
C) sacroplasmic reticulum.
D) sarcolemma.
E) neuromuscular junction.
C) sacroplasmic reticulum.
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Darkness increases secretion of __________ by the pineal gland in the brain. Fill in the blank(s) with the appropriate word(s)
Xylem
a. involves mainly the shoot system. b. includes lignin-reinforced cell walls. c. involves the roots. d. involve stomata. e. includes pipelines that conduct water from soil to leaves.
Which of the following represents a modular organism?
A) lizard B) coral C) dog D) ant
Although the law of independent assortment is generally applicable, when two loci are located physically close to each other on the same chromosome, the phenotypes of the offspring sometimes do not fit the phenotypes predicted. This is due to
A) inversions. B) translation. C) chromosome exchange. D) chromatid abnormalities. E) linkage.