Sarah observed that the mystery pond organisms never come up to the pond's surface. If she catches one of these organisms and observes closely, perhaps dissecting the organism, she should find _____
A) gills
B) spiracles
C) tracheae
D) book lungs
A
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While documenting the synthesis and function of a eukaryotic gene, you prepare two solutions in which you are able to observe the gene being transcribed. Before the process is complete, you add a significant quantity of ?-amanitin to one solution, and compare the results after a few minutes. You find that the DNA in both solutions has been completely transcribed. What conclusion do you draw?
a. The gene is transcribed by RNA polymerase III. b. The gene is transcribed by RNA polymerase II. c. The gene is transcribed by RNA polymerase I. d. ?-amanitin has no effect on DNA transcription.
What is the study of genomes of multiple species that interact in an environment, which can also be used to identify new species, called?
a. gene therapy b. transgenics c. metagenomics d. pharmacogenomics
Primary producers obtain energy from a(n) __________ source and use it to build organic compounds from inorganic
starting materials. Fill in the blank(s) with the appropriate word(s).
Scientists may compare similar genes in different species and determine what percentage of base pairs is identical. From this, it can be estimated how long ago the two species shared a common ancestor. The validity of this conclusion depends on an
important assumption. This assumption is that: A) all living things use the same genetic code. B) both species belong to the same kingdom. C) the gene codes for a functional protein. D) mutations occur at a fairly constant rate in all evolutionary lines.