The discovery of ____ suggested that nucleic acids likely existed prior to proteins
a. RNA
b. ribozymes
c. RNA polymerase
d. peptide bonds
e. endoplasmic reticulum
ANSWER: b
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In the developing nervous system, ________ is the signaling molecule that results in the differentiation of ___________
A. Notch; neurons B. Notch; glial cells C. Delta; glial cells D. Delta; neurons
A urine sample from a 26-year-old woman is examined, and an organism is observed that displays "jerky" motility. This organism is classified as a(n):
a. amebae. b. coccidia. c. flagellate. d. ciliate.
What results would you expect if mitochondria are inherited uniparentally from the ? strain?
A) Some, but not all, yeast colonies found on the plate without chloramphenicol will also grow on the plate with chloramphenicol. B) All of the yeast colonies on the plate without chloramphenicol will also grow on the plate with chloramphenicol. C) Many yeast colonies will grow on the plate without chloramphenicol and no colonies will grow on the plate with chloramphenicol. D) No colonies will grow on either plate.
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.