True or false: Niche and habitat have the same meaning
A. true
B. false
B
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Why would co-administration of a bacteriostatic drug interfere with the effects of penicillin?
A. Since most bacteriostatic drugs are produced from bacteria, but penicillin is produced from mold, the two drugs are incompatible with each other. B. A bacteriostatic drug produces interference in the ability of a bacterial cell to take in compounds from the outside environment. Penicillin must be taken in by the cell in order to have its effect, so this would directly inhibit it. C. Penicillin interferes with cell wall production/stabilization by cross-linking of peptidoglycan. As such, it only works when the cells are actively replicating and MAKING new peptidoglycan. A bacteriostatic drug works by shutting down replication, holding the cells "static." This would interfere with the mode of action required by the penicillin. D. The bacteriostatic drugs would bind directly to the penicillin, preventing both its uptake by the cell and its ability to perform its duty within the bacterial cell.
High levels of what hormone increases the likelihood of fraternal twins?
a. FSH b. LH c. HCG d. progesterone e. estrogen
Most vertebrates maintain homeostasis in regard to the total solute concentrations of their extracellular fluids and the concentrations of specific inorganic ions. The kidneys participate in regulating the extracellular fluid concentration of all ions below EXCEPT
A. Cl- ions. B. Na+ ions. C. Ca2+ ions. D. K+ ions. E. Fe2+ ions.
If an individual has genotype AaBb, how many different gametes can he or she produce? What combinations of alleles are possible?
What will be an ideal response?