The five-carbon sugars of nucleotides are derived from either the ________ or ________.
a) pentose phosphate pathway; Entner-Doudoroff pathway
b) pentose phosphate pathway; the Krebs cycle
c) Entner-Doudoroff pathway; glycolysis
d) glycolysis; the Krebs cycle
Ans: a) pentose phosphate pathway; Entner-Doudoroff pathway
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Which of the following processes produces different proteins in different cells from the same primary transcript?
A. combinatorial control B. alternative splicing C. RNA editing
Sodium concentrations are higher outside and glucose concentrations are higher inside the cell. Using the same membrane protein for Na+ and glucose transport, what is it called when a Na+ electrochemical gradient is used to drive glucose transport into the cell against its concentration gradient?
A. primary active transport B. secondary active transport C. primary facilitated diffusion D. secondary facilitated diffusion E. passive diffusion
A mature ovary, specialized as a vessel that houses and protects seeds, is a
A) fruit. B) ovule. C) cotyledon. D) seed coat.
The helminth parasite Schistosoma
A. is a cestode. B. has snails as intermediate hosts. C. has proglottids. D. is a roundworm. E. has fish as intermediate hosts.