If Peter is allergic to peanuts and Paul is not, what is the precise molecular difference in Peter's bloodstream responsible for this?
A. Peter's blood has mast cells and basophils carrying IgEs that match an antigen on peanuts.
B. Peter's blood has a continually excessive level of histamines and prostaglandins.
C. Paul's blood has mast cells and basophils with IgEs that confer immunotolerance to peanuts, but Peter's does not.
D. Peter inherited a peanut-specific IgG gene from his mother or father, while Paul did not.
A. Peter's blood has mast cells and basophils carrying IgEs that match an antigen on peanuts.
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Four of the following are characteristic of morphogens. Which one is the exception?
a. They are long-range signals in pattern formation. b. They are encoded by master genes. c. They affect gene splicing. d. Their concentration decreases with distance from source. e. They affect development.
A human gamete has 23 chromosomes. How many chromatids would be in a mature cell immediately prior to mitosis?
1.23 2.46 3.69 4.92
The difference between aerobic respiration and fermentation is
A. the amount of NADH that is produced in glycolysis. B. the electron carriers used in the electron transport chain. C. the electron acceptors used in the electron transport chain. D. the fate of the NADH and pyruvate produced in glycolysis.
Only males make the hormone testosterone
Indicate whether the statement is true or false