The enzyme that modifies the mannose group on lysosomal proteins recognizes and binds to a(n)
a. helix.
b. signal sequence.
c. signal patch.
d. KDEL sequence.
Ans: c. signal patch.
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Which of the following is a milestone prokaryotic transcription initiation?
a. polymerase synthesizing mRNA in the 5’ to 3’ direction b. formation of a stable hairpin c. opening of the transcription bubble d. polymerase stalling in a region that is rich in A-T nucleotides
Where in a prokaryotic cell does oxidative phosphorylation occur?
a. Outer membrane of the mitochondria b. Inner membrane of the mitochondria c. Inner part of the cell membrane d. Throughout the cytoplasm
The study of the distribution of animals and
plants around the world is a. diversity. b. biogeography. c. ecology. d. natural history. e. environmentalism
Duchenne muscular dystrophy
a. is an X-linked recessive disorder. b. affects about one in 3,500 boys. c. inevitably results in death by age 25. d. results from an abnormal structural protein in muscle cells. e. fits all of these descriptions.