Which of the following is NOT used or related
to the creation of recombinant DNA?
a. ligases
b. restiction enzymes
c. plasmids
d. SNPs
e. sticky ends
D
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Gene expression can be altered more easily at the level of post-transcriptional processing in eukaryotes than in prokaryotes because _____
A) eukaryotic mRNAs get caps and tails B) prokaryotic genes are expressed as mRNA, which is more stable in the cell C) eukaryotic exons may be spliced in alternative patterns D) prokaryotes use ribosomes of different structure and size
A proficient engineer can easily design skeletal structures that are more functional than those currently found in the forelimbs of such diverse mammals as horses, whales, and bats. The actual forelimbs of these mammals do not seem to be optimally arrange
d because _____. A) natural selection has not had sufficient time to create the optimal design in each case, but will do so given enough time B) in many cases, phenotype is determined by genotype and the environment C) though we may not consider the fit between the current skeletal arrangements and their functions excellent, we should not doubt that natural selection ultimately produces the best design D) natural selection is generally limited to modifying structures that were present in previous generations and in previous species
Tapeworms do not have a
a. reproductive system. b. head. c. excretory system. d. digestive system.
A number of mechanisms operate to maintain genetic diversity in a population. Why is such diversity favored?
A) Genetic diversity may better adapt a population to inevitable changes in the environment. B) Genetic diversity helps populations avoid diploidy. C) Homozygosity is an evolutionary advantage. D) Diversity leads to inbreeding advantages. E) Greater genetic diversity increases the chances of haploidy.