Which one of the following incorrectly pairs a vertebrate group with its major evolutionary innovation?
A. Ostracoderms-cartilaginous endoskeleton
B. Sharks-teeth
C. Dinosaurs-bipedalism
D. Placoderms-jaws
E. Amphibians-paired lateral fins
Answer: E
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What makes eukaryotic transcripts easier to isolate than transcripts in bacteria?
A) Eukaryotic transcripts are not methylated but their genes are often methylated. B) Larger transcript size in eukaryotes enables easy size-selection methods. C) mRNA is polyadenylated in eukaryotes. D) Transcripts are the most abundant RNAs in eukaryotes.
As body temperature rises, how is enzyme activity changed?
a. decreases b. no change c. increases d. decreases and then increases
What does the nucleolus, within the nucleus, synthesize?
a. DNA b. genes c. hormones d. ribosomal RNA e. messenger RNA
Which of the following is true during a typical cAMP-type signal transduction event?
A) The second messenger is the last part of the system to be activated. B) The hormone activates the second messenger by directly binding to it. C) The second messenger amplifies the hormonal response by attracting more hormones to the cell being affected. D) Adenylyl cyclase is activated after the hormone binds to the cell and before phosphorylation of proteins occurs.