Which of the following is the slowest to decompose?
A) proteins
B) sugars
C) lignins
D) cellulose
C
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Steroid hormones bind to receptors inside the cell and alter their conformation. The hormone-receptor complex is then transported into the nucleus, where it can directly affect gene expression. To get from the location where the receptor binds the hormone to its site of action, the hormone-receptor complex must _____.
A) undergo another conformational change B) become water soluble by binding to a carrier molecule C) be transported through the nuclear pore complex D) enter the smooth endoplasmic reticulum
The core of the intestinal microvillus is composed of a tight bundle of ________.
Fill in the blank(s) with the appropriate word(s).
Action potentials in muscle fibers cause
a. the sarcoplasmic reticulum to release ATP. b. the sarcoplasmic reticulum to release calcium. c. myosin-actin bonds to break. d. the energizing of myosin molecules. e. all of these to occur
The different beaks of the many Galapagos finch species are homologous because they are variations of a common ancestral body plan.
a. true b. false