If a modern novel life-form were made, what would this tell us about LUCA?
What will be an ideal response?
ANS:
Because conditions are so different now than they were when LUCA existed, life-forms that evolve today under our current conditions cannot tell us anything about ancestral life-forms, which would have been adapted to the climatic conditions at the time.
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Mitochondrial DNA (mtDNA) is helpful in obtaining a DNA profile for very degraded genetic material because
A) cells have many mitochondria, and therefore several copies of mtDNA sequences. B) mitochondria contain oxidative enzymes that protect the DNA. C) mtDNA consists of a single helix, so it cannot be unwound. D) it uses uracil instead of thymine, which is a more stable nitrogenous base.
Matthew noticed that his house plants were wilting badly. Which cell structure had most likely contracted?
A. cell wall B. plasma membrane C. vacuole D. cytoplasm
Dibenzoylhydrazines are a category of molecules that have been used as insecticides. They work by blocking ecdysteroid receptors. How does this kill an insect?
A. The insect can no longer excrete nitrogenous wastes. B. The insect cannot molt. C. The chitinous exoskeleton is dissolved. D. The insect can no longer coordinate its movements.
DNA ___ is a technique that determines the sequences of bases along a DNA strand.
What will be an ideal response?