Undercooked shellfish contaminated with ________ can lead to foodborne illness
A) Toxoplasma gondii
B) Campylobacter jejuni
C) Listeria monocytogenes
D) Yersinia enterocolitica
E) Vibrio vulnificus
E
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You are testing a new chemotherapy drug that blocks a kinase in the cytoplasm that helps carry signals to the nucleus causing the cell to divide. If you expose cells to the drug at the same time you administer a hormone that should cause the cell to divide, which of the following steps would be blocked?
_____ Receptor activation _____ Signal transduction _____ Activation of transcription factors _____ Cell division
The first experimenters to use Griffith's transformation assay to identify the genetic material were:a
Meselson and Stahl. b. Watson and Crick. c. Franklin and Wilkins. d. Avery, MacLeod, and McCarty. e. Hershey and Chase.
You are given a sample of plant tissue and asked to identify the type of tissue and its location in the plant. Using your microscope, you notice two distinct layers of cells. One layer contains cells that are tightly compacted together while the other layer has loosely arranged cells. The cells in both layers contain many chloroplasts. Based on this information, you determine the tissue is
A. vascular tissue from a leaf. B. mesophyll tissue from a stem. C. vascular tissue from a root. D. ground tissue from a stem. E. mesophyll tissue from a leaf.
Which of the following statements concerning the hepatitis B vaccine is FALSE?
A. It must be given in three doses. B. It is protective against the virus in 95% of vaccinated individuals. C. It is recommended for high-risk groups. D. It must be repeated every five years. E. Immunity can last at least 20 years and may be for life.