Organisms that aerobically catabolize methane use the intermediate ________ for biosynthesis and produce ________ when oxidizing the substrate for energy
A) CH2O (formaldehyde) / CO
B) CH2O (formaldehyde) / CO2
C) HCOO? (formate) / CO
D) HCOO? (formate) / CO2
Answer: B
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Tetrapods colonized land at about the same time as the early _____ radiations around _____ million years ago
A. plant; 575 B. hemichordate; 542 C. arthropod; 420 D. insect; 360 E. plant; 100
Two populations that inhabit the same area but remain genetically distinct can best be called
A. species. B. subspecies (races). C. polymorphic. D. allopatric species. E. sympatric species.
You are working in a cancer lab and are interested in identifying some genes that are important in the onset of lung cancer. You have several genes you think may be involved, so you "print" spots of the DNA sequences of interest on a microarray slide. After doing this, you isolate mRNA from both normal lung cells and cancerous lung cells. Before you use these mRNAs to probe the microarray slide, you need to
A. make cDNA and amplify the cDNA using PCR. B. amplify the mRNA using PCR. C. clone each mRNA into a BAC vector. D. add reverse transcriptase and fluorescent nucleotides to the mRNA to make cDNA. E. sequence the mRNA.
During prokaryotic cell division, two chromosomes separate from each other and distribute into the daughter cells by
a. attachment to microtubules. b. a mitotic spindle. c. repellent forces. d. attachment to separating membrane regions. e. All of the above