Using the techniques of genetic engineering, you design a protein you want to accumulate within the ER of yeast cells. To accomplish this goal, you need to
A) do nothing; all proteins go through the ER.
B) incorporate appropriate mannose-6-phosphate groups.
C) incorporate the appropriate DNA sequence(s) to create signal sequences in the mature peptide.
D) incorporate radioactive amino acids into the protein.
E) remove the N-formyl group located at the N-terminus of the polypeptide.
Answer: C
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Which of the following statements about magnetotaxis in the anaerobic bacteria Aquaspirilium is not correct?
A. Aquaspirilium swim using a flagellum toward magnetic north. B. Aquaspirilium can be attracted to the side of a dish using a bar magnet. C. Aquaspirilium contain bits of magnetized iron oxide used in sensing the earth's magnetic field. D. The earth's magnetic field is on a decline that guides Aquaspirilium deeper into the sediment. E. Anaerobic bacteria from New Zealand that swim toward magnetic south immediately reverse their attraction to magnetic north when moved to a northern environment.
The higher the phenol coefficient value, the ________ effective the disinfectant under the test conditions.
A. more B. less
During the formation of a blood clot, conversion of prothrombin into the enzyme thrombin requires
A) mitochondria. B) transport of proteins from platelets. C) calcium ions. D) leukocytes. E) albumin.
In the lysogenic cycle of bacteriophage ?,
a. a repressor, cI, blocks the lytic cycle. b. the bacteriophage carries DNA between bacterial cells. c. both early and late viral genes are transcribed. d. the viral genome is made into RNA, which stays in the host cell. e. many new viruses are made immediately, regardless of host health.