The citric acid cycle is a cycle because the starting molecule, _____, is regenerated at the end
A. acetyl-CoA
B. oxaloacetate
C. fructose 6-diphosphate
D. pyruvate
E. citrate
B
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During which cellular process do all three forms of RNA associate?
A. ribosome assembly B. chromatin formation C. formation of the nucleolus D. protein synthesis
Allopatric speciation occurs because a population
A. merges with another population of the same species. B. becomes geographically isolated and undergoes genetic change. C. becomes extinct and is replaced by a population of a different species. D. shows no genetic change from generation to generation. E. hybrid sterility occurs.
The SA node, the __________ spontaneously
generates the action potentials that set the pace for cardiac contractions. Fill in the blank(s) with the appropriate word(s).
Amebiasis symptoms include
A. urinary frequency and pain, and vaginal discharge. B. bloody, mucus-filled stools, fever, diarrhea, and weight loss. C. chills, fever, and sweating. D. fever, swollen lymph nodes, and joint pain. E. sore throat, low-grade fever, and swollen lymph nodes.