What molecules in the spliceosome catalyze the intron removal reactions?
A) RNA polymerases
B) ribozymes
C) tRNA
D) introns
Answer: B
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A small angle for a branch point in an evolutionary tree indicates
A. extinction. B. punctuated equilibrium. C. gradualism. D. convergent evolution. E. temporal isolation
What percent of the world's land is used for crops and livestock pastures?
A. 73% B. 13% C. 17% D. 37% E. 7%
Cellular respiration harvests the most chemical energy from which of the following?
A) substrate-level phosphorylation B) chemiosmotic phosphorylation C) converting oxygen to ATP D) transferring electrons from organic molecules to pyruvate E) generating carbon dioxide and oxygen in the electron transport chain
Which of the following is part of the initial response to cold temperature?
A. Vasodilation of peripheral blood vessels B. Panting C. Sweating D. Shunting of the blood to the core regions of the body E. Decreased metabolism