The modern human skull lacks:a
a rounded or U-shaped arrangement of teeth.
b. supraorbital ridges.
c. a large brain case (cranium).
d. small canine teeth.
e. a foramen magnum
B
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The E. coli lac operon encodes three genes. These genes ____
a. cleave lactose into glucose and galactose, produce transacetylase, and actively transport lactose into the cell b. encode an enzyme that cleaves glucose, a transport protein for active transport, and a transacetylase enzyme for solubilizing lactose in the cytosol c. encode an enzyme that cleaves lactose, a transport protein for active transport of lactose, and a transacetylase enzyme whose function is unknown d. catalyze the synthesis of lactose from glucose and galactose, produce transacetylase, and actively export lactose from the cell e. directly interact with the Lac repressor and initiate their own transcription
Based on molecular analysis, which of the following appears to be least meaningful for inferring
animal phylogenic relationships?
a. presence or absence of tissues b. mitochondrial DNA sequences c. radial symmetry in the Radiata d. body cavity differences e. Hox gene sequences
A mole becomes suspicious when it is greater than 6 mm in diameter. How big is 6 mm approximately?
A. about the size of a pencil eraser B. about the size of a quarter C. just barely visible, about the size of a pin prick D. about the size of a nickel E. about the same as one of the letters in this question
Eukarya" is a _________.
Fill in the blank(s) with the appropriate word(s).