A newborn is identified as having cystic fibrosis. While both parents are healthy, a genetic screening of both parents will most likely reveal:
A. the father is a carrier of the mutant CF allele.
B. the mother is a carrier of the mutant CF allele.
C. both mother and father are carriers of a mutant CF allele.
D. neither mother nor father are carriers; spontaneous mutation caused the baby's disease.
C
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Epithelial tissues are held together by ____ junctions
a. tight b. loose c. solid d. gap e. permeable
Some components and breakdown products of commonly used pesticides are intercalating agents, which cause mutations by _____
1.their incorporation into the DNA molecule due to structural resemblance to bases 2.chemically modifying the bases in DNA 3.inserting themselves into the double helix of DNA and causing errors during replication 4.generating free radicals that produce mutations if they interact with DNA
The arrangement of organisms into taxa
A) shows degrees of relatedness between organisms. B) shows relationships to common ancestors. C) was designed by Charles Darwin. D) is arbitrary. E) is based on evolution.
Adult food-borne botulism can be prevented by thoroughly cooking food (minimum 80°C for 20 minutes) before it is eaten.
Answer the following statement true (T) or false (F)