Some protist cell surfaces have ________, including silica or calcium carbonate.
What will be an ideal response?
ECM (extracellular material)
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During metaphase,
A. heterochromatin is converted to euchromatin. B. chromosomes are about 30 nm wide. C. chromosomes are much shorter than they were in interphase. D. chromosomes undergo gene transcription. E. the "beads on a string" structure is visible.
Infectious proteins that are heat resistant and that cannot be destroyed by ultraviolet light or most chemicals are known as ________
Fill in the blank(s) with correct word
Eukaryotic cells spend most of their cell cycle in which phase?
A) interphase B) prophase C) metaphase D) telophase
Based on the fact that CO2 limits photosynthesis in some current environments, what might you conclude about the evolution of photosynthesis?
A. Photosynthesis evolved when environmental concentrations of CO2 were high. B. CO2 levels likely did not have a bearing on the evolution of photosynthesis. C. Photosynthesis evolved in a greenhouse. D. Photosynthesis evolved when environmental concentrations of CO2 were low.