Which of the following do lobsters and clams
have in common with fishes?
a. an exoskeleton
b. a two-chambered heart
c. internal gills
d. skin as a respiratory surface
e. more than one of these
C
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The main reason that mRNA transcripts are modified at the 5' and 3' ends is:
A. to ensure that all nucleotides are phosphorylated. B. to protect the RNA from nucleolytic degradation. C. so that the two ends remain associated with each otherduring transport. D. to guide the removal of introns.
Most genetic alterations performed by researchers aim to change the ____
a. genotype of the organism without a change in phenotype b. genotype of the organism, causing a change in phenotype c. phenotype of the organism without a change in genotype d. phenotype of the organism, causing a change in genotype e. proteome of the organism without a change in genotype
Intermediate filaments assemble and disassemble in a living cell
a. true b. false
The genes that code for blood typing are an example of ____
a. sex-linkage b. segregation c. pleiotropy d. independent assortment e. co-dominance