Heterotrophs must obtain organic molecules that have been synthesized by
A. biogeochemical cycles.
B. bacteria.
C. decomposers.
D. autotrophs.
D. autotrophs.
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Drosophila eggs acquire an initial asymmetry before fertilization as a result of
A. production of bicoid proteins in one end of the egg. B. maternal DNA molecules being deposited in one end of the egg. C. nurse cell migration to one end of the egg. D. maternal mRNA being deposited in one end of the egg. E. attachments of cadherins to one end of the cell.
What type of thinking is required?
What will be an ideal response?
Two noncellular agents, smaller than viruses, are infectious proteins called ________ and infectious RNA strands called ________.
A. viroids; phages B. prions; capsomeres C. virions; prions D. prions; viroids E. prions; phages
In a lysosomal storage disease, newly synthesized lysosome hydrolases are secreted from the cells rather than being delivered to the lysosomes. What is one possible mechanism for this result?
A) The cis-Golgi network lacks a proton gradient. B) The ER is unable to produce lysosomal vesicles. C) Lysosomal enzymes are not phosphorylated in the rER. D) Mannose is not phosphorylated in the cis-Golgi network. E) All the hydrolase genes are mutated, resulting in synthesis by ribosomes free in the cytoplasm rather than on the endoplasmic reticulum membrane.