Regions of a specimen with higher electron density scatter ________ electrons and, therefore, appear ________ in the image projected onto the screen of a transmission electron microscope.
A. more; darker
B. more; lighter
C. fewer; lighter
D. fewer; darker
Answer: A
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Sugars dissolve well in water because of water's ________.
A. polarity B. cohesiveness C. ionic bonds D. hydrophobic exclusion
Where does the Calvin cycle occur?
a. thylakoid membrane b. thylakoid lumen c. stromal lamellae d. cytosol e. stroma
To adjust blood pressure independently in the capillaries of the gas-exchange surface and in the capillaries of the general body circulation, an organism would need a(n) _____
A) open circulatory system B) hemocoel C) two-chambered heart D) four-chambered heart
Target tissues often have receptors for multiple hormones. The response of the target tissue depends on
a. blood levels of and interactions between the hormones that affect it. b. blood levels of the hormones that affect it. c. interactions between hormones. d. blood levels of and interactions between the hormones that affect it and the effects of other signaling molecules, such as prostaglandins. e. growth hormones levels.