Which one of the following statements about RNA processing is true?
A) Exons are cut out before mRNA leaves the nucleus.
B) Ribozymes may function in RNA splicing.
C) RNA splicing can be catalyzed by tRNA.
D) A primary transcript is often much shorter than the final RNA molecule that leaves the nucleus.
B
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Many crustaceans (for example, lobsters, shrimp, and crayfish) use their tails to swim, but crabs have reduced tails that curl under their shells and are not used in swimming. This is an example of _____
A) convergent evolution B) a homologous structure C) natural selection D) a vestigial trait
Mendel chose to study pea plants because they have a long life cycle that offers ample time for analysis
a. True b. False Indicate whether the statement is true or false
Pure-breeding yellow guinea pigs crossed with purebreeding
white ones produce only cream-colored offspring. This pattern indicates incomplete dominance. Rough hair is found to be dominant to smooth hair. Give the F1 and F2 genotypic and phenotypic ratios of a cross of a smooth, white guinea pig with a homozygous, rough, yellow guinea pig. What will be an ideal response?
The chromosomal structure that anchors the spindle fiber to the chromosome is known as the
____________________. Fill in the blank(s) with the appropriate word(s).