What is the function of yolk?
A. Cushions the developing embryo
B. Nourishes the developing embryo
C. Becomes part of the egg placental membrane
D. Provides respiratory surface for the developing embryo
E. Connects the maternal and embryonic circulatory systems
Answer: B
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In DNA, the purines are ____
a. thymine and cytosine b. adenine and cytosine c. adenine and guanine d. thymine and adenine e. guanine and thymine
This arthropod is the vector for Lyme disease
a. spider b. tick c. wasp d. mosquito e. mites
By their experimentation using the Neurospora fungus, Beadle and Tatum were able to propose the far-reaching hypothesis that ________
A) several different enzymes may be involved in the same step in a biochemical pathway B) more than one codon can specify a given amino acid C) genetic recombination occurred in Neurospora D) prototrophs will grow only if provided with nutritional supplements E) the role of a specific gene is to produce a specific enzyme
Which biochemical reaction is catalyzed by a ribozyme?
A. RNA polymerization during transcription in prokaryotes B. DNA polymerization during DNA replication C. peptide bond formation in protein synthesis D. RNA polymerization during transcription in eukaryotes E. peptide bond hydrolysis by proteases