Which of the following are antigens?
1. toxins
2. chemicals
3. foreign particles (for example, splinters)
4. drugs
A) 1, 2, and 3 only
B) 2 and 3 only
C) 1 and 4 only
D) 1, 2, 3, 4
Answer: D
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Trace elements
A. include zinc, copper, and manganese. B. are required in large amounts. C. may be needed for enzyme function. D. are involved in maintaining pH in the cell. E. include zinc, copper, and manganese AND may be needed for enzyme function.
What is the correct order of steps of morphogenesis in Drosophila melanogaster?a. Gap genes divide the body into broad regionsb. Establishment of anterior / posterior axesc. Homeotic genes determine which body parts arise from each regiond. Pair-rule genes are activated in order to develop a preliminary segmentation pattern
A. a - b - c - d B. a - d - c - b C. a - d - b - c D. b - a - d - c E. b - a - c - d
Long-term memory involves:a
holding seven chunks of information at a given time. b. meaningfully associating stimuli with past knowledge. c. strengthening connections between the pons and cerebral cortex. d. filtering out nonessential information and stimuli. e. the hypothalamus placing our experiences in categories
What will happen by the end of the eighth week of development?
A. Limbs form, and paddles at their ends are sculpted into digits. B. The umbilical cord and the circulatory system develop. C. All of the organ systems will be formed, and apoptosis has eliminated the tail. D. The fetal heartbeat can be heard clearly through a stethoscope positioned on the mother’s abdomen. E. The fetus has begun not only to detect sounds but also to remember some of them.