Which of the following is not a characteristic of an endotoxin?
A. Neurotoxic
B. Heat stable
C. Moderate toxicity
D. Weakly immunogenic
Ans: A. Neurotoxic
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Cork cambium produces ____
a. vascular tissue b. heartwood c. vascular cambium d. sapwood e. secondary epidermis
What happens during nondisjunction?
a. Cells enter a brief interphase between meiosis I and meiosis II. b. Pairs of homologous chromosomes or sister chromatids fail to separate during meiosis. c. Cells divide evenly during meiosis. d. One segment of a chromosome dissociates and reattaches to a different, nonhomologous chromosome.
Crossing over is one of the most important events in meiosis because
a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. the number of chromosomes allotted to each daughter cell must be split in fourths.
During flu season, influenza virus infects many members of the population. During infection, the virus binds to the outside of a cell and tricks that cell into “eating” the virus. Once inside, the virus infects the cell and forces the cell to make more viruses that can then go on to infect more cells. What type of cell transport is the virus using to get into the cell?