The origin of a skeletal muscle is
(a) attached to the less mobile portion of the skeleton.
(b) attached to the portion of the skeleton that moves when the muscle contracts.
(c) never attached to the skeleton.
(d) its belly.
(c) never attached to the skeleton.
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Which of the following is mismatched with regard to similar excellular structures in plant and animal cells?
A) elastins-extensins B) extracellular matrix-cell wall C) collagens-cellulose D) proteoglycans-hemicelluloses E) fibronectins-pectins
Theoretically, a tariff imposed to protect an infant industry should be removed
a. within five years. b. when the industry becomes sufficiently diversified. c. when prices charged reflect production costs. d. when the industry has matured.
Suppose that a homeotic gene from Drosophila is introduced into an Arabidopsis embryo that has a pre-existing mutation in one of its homeotic flower genes. What effect would you expect and why?
A) rescue (or negating) of the phenotype of the mutant because the fly Hox gene supplies the missing protein B) correction of the sequence in the mutant by recombination with the Drosophila gene sequence C) expression of the Drosophila homeotic gene correcting the mRNA of the mutant plant D) a mixture of roughly equal numbers of Drosophila and plant gene product, producing an intermediate phenotype E) no effect, because Hox genes are different from MADS box genes
Which of the following explains the events occurring when water boils?
a. Hydrogen bonds are broken between neighboring water molecules. b. Covalent bonds are broken between oxygen and hydrogen atoms. c. Ionic bonds are broken when the minerals in water are heated. d. The bond between one water molecule and another is strengthened. e. The hydrogen atoms break away from the oxygen and escape as vapor.