During which growth phase will Gram-positive bacteria be most sensitive to penicillin?
a. lag phase
b. log phase
c. stationary phase
d. equally sensitive in all phases
Ans: b. log phase
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You go for another hike in the forest and wind up back at the same population of 100 flowering plants. You notice that one individual of the population grows in full shade, and all the others grow in at least partial sun
You take a leaf sample from the individual in the shade, sequence its DNA, and notice that the individual is heterozygous. There is a mutation in the LLT gene (the mutant is designated LLT-s). t or f: This population can evolve. t or f: This population can only evolve through genetic drift. t or f: This population can only evolve through natural selection. What will be an ideal response?
Portuguese water dogs have evolved to spend a lot of time in water and thus have webbed
feet. What process does not occur in these dogs but does occur in other dogs that do not have webbed feet?
a. apoptosis b. mitosis c. cell differentiation d. signaling pathways
The pain produced in an internal organ may be perceived as occurring somewhere else. This phenomenon is called
____. a. mixed nerve messages b. referred pain c. phantom pain d. psychosomatic pain e. hypochondria
Cells produced by dividing B or T cells may immediately begin to destroy an invader. These cells are
called a. effector cells. b. memory cells. c. dendritic cells. d. phagocytes. e. fibroblasts.