Hundreds of thousands of vitamin A deficiencies, and its resulting blindness, may be avoided with the
use of genetically modified ____________________. Fill in the blank(s) with the appropriate word(s).
ANS: rice
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Which of the following types of microscopy can be used with live cells?
A) phase-contrast microscopy B) transmission electron microscopy C) bright-field microscopy D) scanning electron microscopy
Examine Figure 21.14. If you wanted to use a molecular clock to date a relatively recent divergence event—say, one that occurred in the last 100 million years or so—which of the four types of genes would make the best clock? Why?
A. Fibrinopeptides, because they have changed the most over that time period. B. A histone gene, because it has changed relatively little over that time. C. Fibrinopeptides, because they have changed relatively little over that time. D. A histone gene, because it has changed the most over that time period. E. Hemoglobin, because of its moderate rate of change.
The predominant cell type in connective tissue is the ____, which secretes components of the _____
a. neuroglia; nerve fiber sheath b. fibroblast; extracellular matrix c. cartilage; extracellular matrix d. melanocytes; melanin e. bone; skeleton
What role do chaperone proteins play?
A. They make sure that nucleotides are in the right position. B. Make sure that proteins are folded correctly. C. Are caps on lipids. D. Control the movement of water throughout the cell.