The simplest structure shared among all living organisms is the
A. gut.
B. cell.
C. photosynthetic chloroplast.
D. community.
E. nucleus.
Answer: B
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Which factor has little effect on the rate of transpiration?
a. air temperature b. relative humidity c. air movement d. the amount of direct solar radiation e. daily fluctuations in atmospheric carbon dioxide concentrations
The expression of ABC genes _____
a. occurs in layers b. controls flower formation c. causes mutations in flowers d. occurs in layers and control flower formation
Which types of bonds are possible between a
hydrogen atom and another atom within the same molecule?
a. hydrogen only b. single bonds only c. single bonds and double bonds d. single, double, and triple bonds e. single, double, triple, and hydrogen bonds
Scientists preparing preserved animals often inject colored latex into the circulatory system to identify different kinds of vessels. What color of latex is likely to be seen in blood vessels carrying oxygen-poor blood?
A. blue latex B. pink latex C. both colors mixed together D. spots of different colors in different parts of the pig E. None of the answer choices is correct.