Mendel crossed true-breeding plants having yellow peas with true-breeding plants having green peas. The resulting
plants all had yellow peas. An F1 cross resulted in 3/4 of the plants having yellow peas and 1/4 of the plants having green
peas. What does this tell you about the alleles for color?
a. yellow is usually the dominant color, but sometimes green can be dominant
b. green is the dominant color
c. yellow is the dominant color
d. yellow is the recessive color
e. yellow and green are codominant
ANSWER: c
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To remove noncoding sequences in the pre-mRNA of eukaryotes, multiple snRNPs combine with proteins to form a larger complex called the ___________ .
A. 5' cap B. introsome C. ribosome D. spliceosome E. 3' poly-A tail
Which disease may produce a malformed
embryo if the mother develops the disease in the first three months of a pregnancy?
a. German measles (rubella) b. chicken pox c. red measles d. hepatitis e. mumps
The best contraceptive device to prevent the spread of sexually transmitted diseases is the
A. condom. B. diaphragm. C. IUD. D. contraceptive pill.
The best way to directly observe spirochetes is
A. Bright-field microscopy. B. Dark-field microscopy. C. fluorescent microscopy. D. electron scanning microscopy.