Imagine that scientists have discovered a new planet apparently devoid of life, but having ice caps located at the poles
These ice caps reveal that the planet's atmospheric O2 levels
sharply increased about 1,000,000 years ago, but then quickly dropped 50,000 years ago.
What could have accounted for these changes in atmospheric O2 levels?
A. Photosynthetic organisms evolved on the
planet 100,000 years ago, but went extinct
50,000 years ago.
B. Photosynthetic organisms evolved on the
planet 50,000 years ago.
C. Oxygen-based mammalian life evolved on
the planet 100,000 years ago, and
photosynthetic organisms evolved 50,000
years ago.
D. Oxygen-based mammalian life evolved on
the planet 100,000 years ago.
A
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Transcriptome analysis is useful in relation to genome analysis because
A) it is NOT dependent on nucleic acid sequencing technology. B) it results in amino acid sequence and is, thus, easier to analyze. C) it analyzes RNA, thus it reveals which genes are expressed under different conditions. D) it reveals interactions between molecules and, thus, provides more information than genome analysis.
Possessing the entire sequence of a particular human genome may not be as useful as we think. Why not?
A. Every human genome is different enough that knowing ONE human's DNA sequence can't tell us almost anything about ALL humans. B. It's not the DNA sequence that matters-we need to know the mRNA sequence of the human genome. C. Due to the presence of introns/exons, and splicing of RNA after transcription, the DNA sequence doesn't necessarily tell us the exact number/type of proteins that will eventually be made from it. D. The amount of "junk DNA" present in the human genome masks any useful genetic information that we'd like to obtain.
At least __________ million people are now infected
with HIV. a. 1 b. 6 c. 12 d. 20 e. 40
Which infection are you likely looking at if you view a direct smear of a cervical scraping and see enlarged (multinucleate giant) cells and intranuclear inclusions?
A. HSV-2 B. HPV C. EBV D. VZV E. HCV