What biological technique has provided evidence in establishing the eukaryotic superkingdoms?
A. molecular sequence comparisons
B. bacterial culturing
C. the identification of land plants
D. visualizing cell shape
A
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After food has passed from the stomach, where does it move next?
a. large intestine b. small intestine c. colon d. liver
If a mutation prevented the formation of lignin, which tissue would be most affected?
a. vascular cambium b. parenchyma c. collenchyma d. sclerenchyma e. mesophyll
The difference between a stable isotope and a radioisotope is that:a
the stable isotope emits radiation. b. the radioisotope emits radiation. c. the stable isotope emits light. d. the stable isotope absorbs radiation. e. the radioisotope has an unequal number of protons and electrons.
Which of the following is a function of inhalation through the pharynx in mammals, in addition to bringing oxygen into the respiratory system?
a. cooling the body temperature b. contributing to osmotic balance via water loss c. filtering out inhaled particulate matter d. drying of the air before it reaches the lungs