Molecules made primarily of carbon and hydrogen are called hydrocarbons. How many hydrogen atoms are present in each of the following molecules? A hydrocarbon chain of five carbon atoms with two double bond and two single bonds?
A. 6
B. 8
C. 10
D. 12
Answer: B
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Cells need increased surface area for diffusion of nutrients and wastes. Cells increase their surface area by
A. having microscopic extensions of the cell membrane. B. having a flattened shape. C. being long and thin. D. having specialized organelles to move components throughout the cell. E. All of the answer choices are correct.
Choose the correct order of steps for the synthesis of Vitamin D
a. Inactive vitamin D is transported to the liver where it is modified. b. Inactive, chemically altered vitamin D is transported to the kidneys. c. UV light strikes the skin and converts a steroid molecule into an inactive form of vitamin D. d. Vitamin D is activated under the influence of PTH. A) a, b, c, d B) c, b, a, d C) c, a, b, d D) a, c, b, d E) d, a, c, b
____ are small leaves with a single vascular strand
a. Megaphylls b. Microphylls c. Thalli d. Strobili e. Sori
In the study of microbial communities, a new technique using microelectrodes is helping us to infer data about microbial activity. Microelectrodes are capable of measuring which of the following data? (Check all that apply.)
A. Measuring oxygen and nitrogen tension B. Measuring electron donors and receptors C. Measuring DNA amounts in the sample D. Measuring pH