The side toes of a horse, the pelvis of the whale, and the human appendix are all examples of structures that resemble structures of presumed ancestors, which are known as
A. analogous structures.
B. homologous structures.
C. vestigial structures.
D. homeotic mutations.
E. acquired structures.
C. vestigial structures.
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Neurons and some other specialized cells divide infrequently because they _____
A) no longer have active nuclei B) no longer carry receptors for signal molecules C) have entered into G0 D) can no longer bind Cdk to cyclin E) show a drop in MPF concentration
In response to induction by the optic vesicle,
a. genes coding for crystallin and keratin are activated. b. genes coding for only crystallin are activated. c. genes coding for only keratin are activated. d. genes coding for crystalline and keratin are not activated. e. apoptosis occurs.
Recombinant DNA
a. is crucial in genetic engineering. b. can be produced with new biological techniques. c. uses restriction enzymes for its creation. d. relies on bacterial plasmids. e. all of these
Which sentence below is correct:
a. Both transcription and translation start at the beginning of the gene. b. Transcription starts on the mRNA at a promoter and translation starts at the 5' end of the mRNA. c. Transcription starts at a promoter on the DNA and translation starts at the start codon on the DNA. d. Transcription starts at the promoter on the DNA and translation starts at the start codon on the mRNA.