Which of the following cell shapes look like a comma?
A) spirochetes B) stella C) bacilli D) vibrio E) coccobacilli
Answer: D
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Which of the following events represses the expression of the bacteriophage ? cI gene?
A. activation of PRE by cII protein B. Cro protein binding to the OR3 operator C. multiple viral particles infecting a single cell D. cIII protein protecting cII from proteolysis
The undifferentiated genitalia of an early human embryo develops into male genitalia under the influence of ____
a. oxytocin b. prostaglandin and DHT c. prolactin d. testosterone, AMH, and DHT e. Wolfian duct inhibitors
Which sequence places the tissues in the stem of a young tree in the correct order, starting from the exterior of the plant with the outermost layer of stem tissue, and moving toward the centre?
a. secondary phloem ? primary xylem ? secondary xylem ? primary phloem b. primary phloem ? secondary xylem ? secondary phloem ? primary xylem c. primary phloem ? secondary phloem ? secondary xylem ? primary xylem d. primary xylem ? secondary xylem ? secondary phloem ? primary phloem
During penetration of an Escherichia coli cell by the T4 bacteriophage,
a. the envelope fuses with the cell membrane, allowing the phage nucleocapsid to enter the cell. b. integrase makes a pore in the cell wall, the tail sheath contracts, and the phage DNA is injected into the cell. c. T4 lysozyme makes a pore in the cell wall, the tail sheath contracts, and the phage DNA is injected into the cell. d. T4 lysozyme facilitates membrane fusion, allowing the phage to enter the cell.