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?
A. There would be no effect on the ability of the plant to make glucose B. Plants would make less sugar than normal C. Plants would be able to make more sugar than normal
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