Which statement regarding porphyrin synthesis pathways is CORRECT?
A. The succinyl-CoA/glycine porphyrin pathway is used by all bacteria, photosynthetic eukaryotes, and archaea.
B. The porphyrin biosynthetic pathways are unified at the step of 5-aminolevulinic acid.
C. The glutamate porphyrin pathway is used by all non-photosynthetic eukaryotes and alpha-proteobacteria.
D. There is very little conservation of porphyrin synthesis pathways between eukaryotes, bacteria, and archaea.
Answer: B
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Which of the following would best reflect the general steps of an enzyme-catalyzed reaction?
A. enzyme undergoes conformational changes ? substrates bind to enzyme ? substrates are converted to products ? products are released. B. substrates bind to enzyme ?substrates are converted to products ? enzyme undergoes conformational changes ? products are released C. substrates bind to enzyme ? enzyme undergoes conformational changes ? substrates are converted to products ? products are released D. enzyme undergoes conformational changes ?substrates are converted to products ? substrates bind to enzyme ? products are released E. substrates bind to enzyme ? substrates are converted to products ? products are released ? enzyme undergoes conformational changes
If a plant's stomata were always closed, how would this affect the plant's ability to make glucose?
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Can epigenetic change cause any differences between different cells in a single organism?
What will be an ideal response?
The peritoneum can function as a dialyzing membrane in a procedure called ________
Fill in the blank(s) with correct word