All of the following are correct about food irradiation, except
A. it can lead to a longer shelf life for the irradiated food.
B. no irradiated food can be sold without clear labeling.
C. food is not made radioactive by the process.
D. the World Health Organization does not endorse this process.
E. it is approved in the U.S. for beef, chicken, and pork.
Answer: D
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During endocytosis, if a bacterial cell is not degraded and bacterial DNA is taken up by the eukaryotic cell, what may have occurred?
A. vertical evolution. B. horizontal gene transfer. C. vertical exon shuffling. D. chromosomal duplication and genomic exchange. E. both chromosomal duplication and vertical evolution.
During exposure to elevated glucose, a yeast cell will increase its uptake of glucose. Describe the mechanism by which the yeast sense the extracellular glucose.
A. By the increase in energy outside the cell when the glucose is metabolized. B. By glucose diffusing into the nucleus and binding to transcription factors. C. By the increase in energy inside the cell when the glucose is metabolized. D. By glucose uptake through glucose transporters. E. By glucose binding to glucose receptors.
During ejaculation sperm pass from the
epididymis into the
a. vas deferens. b. bulbourethral gland. c. prostate. d. scrotum. e. urethra
Disturbances in sensory neurons will result in an
action potential if the a. potential is graded. b. potential change remains local. c. graded potential of threshold size reaches a trigger zone. d. localized potential changes do not spread too far. e. potential changes become downgraded to localized ones.