The presence of the SRY gene product has the effect of ________
a. preventing the formation of testes
b. making the gene carrier male
c. all of the choices
d. triggering the formation of ovaries
b
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(Please choose from the lettered responses below.) Phylogenetic trees help us understand: 1. the genetic relationships among a species. 2. the evolutionary relationships among a species. 3. the relationships of symmetry among related species. 4. the level
A. 1 and 2 B. 2 and 3 C. 2 and 4 D. 3 and 4
Which of the following does not represent a method by which cells regulate enzyme activity?
a. controlling the intracellular concentration of the enzyme b. feedback inhibition of enzymes c. the binding of allosteric regulators to allosteric sites on the enzyme d. differential gene expression of the genes that produce enzymes e. heat denaturation of the enzyme
You have been studying a newly discovered species of lemur. You have established that sexual selection has been a powerful force in the evolution of this species and it is clear that female choice plays an important role in determining which males procure mates. After many hours of observation and data collection, you find that females prefer males that are more proficient at collecting sap and fruit. You should conclude that your data strongly supports the good genes hypothesis.
Answer the following statement true (T) or false (F)
Penicillin inhibits bacterial growth by preventing the cross-linking during peptidoglycan synthesis. Why does penicillin not inhibit growth of archaeal cells?
A. Archaeal cells do not have a cell wall. B. Pencillin is unable to penetrate the S layer to reach the peptidoglycan layer underneath. C. Penicillin is unable to penetrate the lipid outer membrane that blocks access of penicillin to the peptidogycan crosslinking enzymes. D. Most archaeal cells have a cell wall, but it is not composed of peptidoglycan.