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

Biology & Microbiology

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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

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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

Biology & Microbiology