Which of the following is not true in regard to crossover?
A. Spindle microtubules guide the transfer of DNA across the synaptonemal complex.
B. Nonsister chromatids exchange genetic material.
C. Chiasmata are formed.
D. Recombination nodules mark the crossover point.
Ans: C. Chiasmata are formed.
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Which of the following statements about allosteric control of enzymatic activity is true?
A. Allosteric proteins are generally composed of a single protein. B. Heterotropic allosteric effectors compete with substrate for binding sites. C. Homotropic allosteric effectors compete with product for binding sites. D. Allosteric effectors enhance the hyperbolic nature of V0 versus [S] kinetic plots. E. Allosteric effectors give rise to the sigmoidal nature of V0 versus [S] kinetic plots.
Which of the following cell types would have the highest concentration of metabolic enzymes?
A. nerve cell B. mammary cell C. lung cell D. liver cell E. cartilage cell
Which of the following statements best describes the structure of a hemoglobin molecule?
A. Hemoglobin is comprised of three globin molecules and one heme group per hemoglobin molecule. B. Hemoglobin is comprised of four globin molecules, each with their own heme group that binds to and carries oxygen. C. Hemoglobin is comprised of four globin molecules, each of which contain millions of heme groups. D. Hemoglobin is comprised of two globin molecules, both with their own heme group that binds to and carries oxygen.
In the scientific name of humans, Homo sapiens, the term Homo is the
A) class. B) family. C) genus. D) species. E) order.