Describe a somewhat extraordinary finding related to the Tetrahymena telomerase enzyme
What will be an ideal response?
The enzyme contains a short piece of RNA that is essential for its catalytic activity.
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List the primary germ layers formed by gastrulation. What tissues will they form in the adult?
Endoderm: Mesoderm: Ectoderm:
Of the following molecules, which passes through a lipid bilayer most readily?
A. carbon dioxide B. glucose C. K+ D. arginine E. RNA
A drug that inhibits the Y5 receptor has been shown to
a. have an effect on body weight in normal rats. b. have an effect on body weight in obese rats. c. have an effect on food intake in normal rats. d. have an effect on food intake in obese rats. e. have no effect on food intake or body weight in any rats.
Some internally fertilized eggs develop and hatch outside the mother's body. What is this developmental strategy called?
A. oviparity B. marsupial development C. placental development D. vivipary