In England, at a time when milk was still delivered to doorsteps each morning in foil-capped glass bottles, a songbird called the great tit started pecking through the caps and drinking the cream in the necks of the bottles. This behavior spread through
the great tit population in a matter of years. The emergence and spread of this behavior probably depended on
A) trial-and-error learning plus habituation.
B) trial-and-error learning plus social learning.
C) trial-and-error learning plus imprinting.
D) habituation plus social learning.
Answer: B
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Staphylococcus aureus appears to be very adept at acquiring virulence and antibiotic resistance genes from other bacteria.
Answer the following statement true (T) or false (F)
Answer the following statements true (T) or false (F)
1. Stem cells have determinate cleavage. 2. Large differences in body form can result from only small differences of gene expression. 3. Radiata have neither an anterior end nor a posterior end. 4. All eumetazoans have cell junctions.
Oligomycin is an antibiotic that binds ATP synthase, blocking the flow of protons through the enzyme's proton channel. In addition to preventing synthesis of ATP, what additional effect might you expect in response to the presence of oligomycin?
A. higher pH in the intermembrane space B. lower pH in the intermembrane space C. a buildup of protons in the mitochondrial matrix
Immunity that develops over time due to exposure to various antigens is termed
a. adaptive immunity. b. learned immunity. c. compensated immunity. d. coordinated immunity. e. innate immunity.