The modern idea of extinction as a common occurrence in Earth's history was first proposed in the early 19th century writings of __________.
a. Cuvier
b. Lamarck
c. Aristotle
d. Wallace
e. Lyell
Answer: a. Cuvier
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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
During a synthesis reaction, glucose and fructose combine to form ____
a. glycogen b. sucrose c. starch d. a monosaccharide e. a polysaccharide
A polygenic trait can have
A) fewer genotypes than most single-gene traits. B) many possible genotypes, but few possible phenotypes. C) many possible genotypes, producing many possible phenotypes. D) fewer phenotypes than most single-gene traits
Ca2+-pumps in the plasma membrane and endoplasmic reticulum are important for _____________
(a) maintaining osmotic balance. (b) preventing Ca2+ from altering the activity of molecules in the cytosol. (c) providing enzymes in the endoplasmic reticulum with Ca2+ ions that are necessary for their catalytic activity. (d) maintaining a negative membrane potential.