What invention about 11,000 years ago led to a boom in the human population?
a. the wheel
b. agriculture
c. the printing press
d. the steam engine
e. the written language
ANSWER: b
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The cell walls of fungi are made up of polysaccharides including
A. polyglycans. B. phospholipids. C. bilipid layers. D. glycolipids. E. chitin.
Gene knockdown via RNAi relies on the ability of eukaryotic cells to
A) degrade target mRNAs that are complementary to introduced dsRNA. B) induce microRNA expression under particular conditions. C) preferentially degrade mutated mRNAs. D) inhibit transcription of sets of genes based on the presence of distal control elements. E) preferentially degrade mutated mRNAs by inducing microRNA expression under particular conditions.
Bonds between which groups stabilize the structure of many proteins, including those that make up human hair?
A. Aldehyde B. Sulfhydryl C. Hydroxyl D. Methyl E. Carbonyl
A puppy is born with a malformed right leg. A veterinarian studies the animal and determines that all of the correct types of cells are present, but that the leg simply took on the wrong shape. This is most likely a problem of
A) morphogenesis. B) cell differentiation. C) histogenesis. D) preformation. E) fertilization.