Optometrists, who help patients with their vision problems, know that certain types of repetitive use of the muscles around the lens of the eye can "train" the lens to become flatter than normal
This often occurs in truck drivers, sailors, and other people who focus on the horizon or at great distances for long periods of time. What would be the consequence of this on the eye over a long time period?
A) Nearsightedness B) Farsightedness
C) Complete blindness D) Color-deficiency
B
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This class of macromolecules serves as important energy stores and is a major component of plasma membranes.
A. lipids B. carbohydrates C. nucleic acids D. proteins E. ions
Water molecules are attracted to each other due to the opposite charges created by partial charge separations within the molecules. These attractions are called:
A. peptide bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds. E. double bonds.
Which tissue has no direct blood supply?
a. cartilage b. adipose c. loose connective d. dense connective e. bone
Ectomycorrhizae:a
form arbuscules. b. are intracellular. c. coat the plant root. d. have glomeromycetes as the fungal component. e. supply plants with organic molecules.