An Rh- ______ baby born to an Rh- _______ mother is at risk for attack by maternal antibodies
a. negative; negative
b. negative; positive
c. positive; negative
d. positive; positive
e. neutral; positive
C; Mothers who are Rh-negative can become sensitized to the Rh-positive antigen because they do not have it, and it is therefore foreign to them. However, Rh-positive mothers cannot be sensitized to an Rh-negative infant (choice b), because this baby does not have the antigen at all, and does not have anything that the mother's immune system will identify as foreign. If the mother and baby match (choices a and d), there is no problem.
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Which of the following types of molecules are the major structural components of the cell membrane?
A) phospholipids and cellulose B) nucleic acids and proteins C) phospholipids and proteins D) proteins and cellulose E) glycoproteins and cholesterol
Which of the following is NOT characteristic of a coliform?
A) facultatively aerobic B) gram-negative C) rod shaped D) resistant to chlorination
The Panamanian golden frog is in decline because of ________, which are being driven by ________.
A. introduced species; increased global trade B. outbreaks of a fungus; deforestation C. outbreaks of a fungus; global climate change D. outbreaks of a virus; global climate change E. outbreaks of a virus; deforestation
Suppose that your father is heterozygous for a recessive disorder. Also suppose that you know your mom has two "good" alleles. What is the probability that you will have the disorder?
a. 75% b. 50% c. 25% d. 0%