Ackermann et al. (2003) investigated senescence in bacteria. What do the following results demonstrate and why are they surprising given evolutionary theory on aging?
a. Bacteria do not senesce. Every organism should show trade-offs between fitness and longevity.
b. Bacteria do not senesce. Extrinsic mortality is not constant throughout the life of a bacterial cell.
c. Bacteria do senesce. Pleiotropy is the rare exception in simple bacterial genomes.
d. Bacteria do senesce. Cell propagation and reproduction are the same in bacteria.
D
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A scientist found an unweathered igneous rock that contained .025 g of potassium-40 and .075 g of argon-40. The half-life of potassium-40 is 1.3 billion years. The rock would be estimated to be
A. 2.6 billion years old. B. 0.050 billion years old. C. 1.3 billion years old. D. 0.001875 billion years old. E. 1.69 billion years old.
Growth of yeasts and molds will be favored in more acidic foods.
Answer the following statement true (T) or false (F)
What type of cross is performed to determine the genotype of an individual?
A) A testcross B) A dihybrid cross C) A monohybrid cross D) A genotyping cross E) A controlled cross
A transcription factor can have multiple domains
a. true b. false