In lab, you are asked to label the parts of a sperm cell model. Which of the following would not be observed on the model?
A. flagellum
B. cilia
C. nucleus
D. acrosome
E. mitochondrion
B. cilia
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Which of the following is the most serious toxin involving acetylcholine?
a. Botulinum b. Prairie rattlesnake venom c. Hemicholinium-3 (HC-3) d. Black widow spider venom
The structure labeled "G" is the
a. aorta. b. pulmonary vein. c. pulmonary artery. d. inferior vena cava. e. superior vena cava
James Watson and Francis Crick
a. were both English researchers working at Cambridge University. b. performed elegant experiments in DNA chemistry. c. constructed an accurate model of the DNA molecule illustrating its structural simplicity. d. performed experiments that convinced scientists that DNA is a double-stranded molecule. e. did all of these
Your throat is dry, and you want the last cough drop in the box to last a long time in your mouth. What should you do?
A) Break the cough drop into little pieces and put them all in your mouth. Since each little piece must be dissolved separately, the drop will last longer. B) Keep the cough drop whole. This maintains the largest surface-to-volume ratio and slows the dissolution of the cough drop. C) Break the cough drop into little pieces and put them all in your mouth. This decreases the surface-to-volume ratio and slows the dissolution of the cough drop. D) It doesn't matter if the cough drop is in one piece or many pieces; the total amount of cough drop is all that matters.