A student set up an experiment to test if plants give off water vapor. Fifty pea plants, growing in pots, were covered with individual glass containers and left overnight. The next morning, the inside of each lid was covered in droplets of water. The lab student concluded that plants generally give off water vapor. What critique would you make of the experimental design?
A. There was no control so the water could have come from other sources such as air in the jar or the soil.
B. There was not a large enough sample of pea plants used to get adequate data.
C. The student did not have a clearly stated hypothesis before beginning the experiment.
D. The experiment was not precise, meaning it was not reproducible.
A
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Franklin and Wilkins analyzed DNA by bombarding DNA crystals with X-rays. Their analysis yielded two numbers that sparked interest, 3.4 nm and 0.34 nm. What is the significance of these numbers?
A) It turned out to be just a coincidence. B) DNA molecules are 3.4 nm long and 0.34 nm wide. C) The width of a DNA molecule is 3.4 nm, whereas the width of a nucleotide monomer is 0.34 m. D) These numbers tell us there are ten rungs, or steps, on the DNA "ladder" for every turn of the helix. E) The 10 to 1 ratio signifies that DNA molecules are ten times longer than they are wide.
The term antiparallel The term antiparallel
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Figure 31.8A
The accompanying figure is a micrograph of what kind of tissue?
A. Cardiac muscle B. Skeletal muscle C. Smooth muscle D. Cartilage E. Dense connective
Prokaryotes were once described based on structures that were present in eukaryotes, but absent in prokaryotes.
Answer the following statement true (T) or false (F)