Why do we require a separate set of theories for the origin as compared to the maintenance of sexual reproduction?
a. The benefits or costs of sexual reproduction were not realized until a fully functional system of sexual reproduction was in place.
b. Extant asexual organisms had sexual ancestors.
c. Origin and maintenance require different explanations by philosophical ne-cessity different explanations.
d. Sex may have evolved multiple times.
e. A and B.
E
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This organism, belonging to the family Enterobacteriaceae, grows best at 25°C to 30°C. Domestic and wild rats and other animals can carry this organism. What is the medium of choice?
a. MacConkey agar b. Xylose-lysine-deoxycholate (XLD) agar c. Cefsulodin-irgasan-novobiocin (CIN) agar d. Hektoen enteric (HE) agar
What is the importance of a cell being able to regulate gene expression?
What will be an ideal response?
Proteins are made up of ________ held together by ________ bonds.
A. polymers; hydrogen B. amino acids; peptide C. monomers; ionic D. monosaccharides; covalent
The cells illustrated in Figure 3.1 are in a(n) ________ environment.
A. hypotonic B. hypertonic C. isotonic D. fluid mosaic E. passive