Which of the following mutations would not result in antibiotic resistance?
a. Missense mutation
b. Nonsense mutation
c. Silent mutation
d. Frameshift insertion
e. Frameshift deletion
Answer: c. Silent mutation
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What is the direction of sodium ion flow through leak channels in a photoreceptor cell in the dark?
A. from the cytoplasm to the extracellular space B. from the smooth endoplasmic reticulum to the cytosol C. from the extracellular space into the cytoplasm D. from vesicles into the synapse
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
Some cells contain membrane-bound
compartments called
a. organs. b. organites. c. organelles. d. organella. e. organellum.
What are single-celled forms of fungi called?
a. Yeast b. Viruses c. Lymphocytes d. HIV