The Cambrian Explosion provided a wealth of fossil remains for scientists to uncover. Many of the animals from this time period had tough skins or shells. This would
a. protect the animal from osmotic pressure.
b. be a disadvantage for these organisms and lead to their death and fossil formation.
c. protect the animal from predators.
d. make these animals more desirable to predators.
e. allow the animals to move into different environments easily.
C
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Which of the following is not a step in nonhomologous end joining?
A. phosphorylation of the Ku70-Ku80 complex B. degradation of any single-strand overhangs or hairpins from the broken ends of the chromosomes to be repaired C. binding of the Ku70-Ku80 complex to the broken chromosome ends D. binding of a kinase and a nuclease to the Ku70-Ku80 complex on the DNA E. All of the steps given occur in NHEJ.
All of the following are viral infections, except
A. hepatitis. B. warts. C. HIV/AIDS. D. herpes. E. chlamydia.
The term "archenteron" refers to the developing:a
gut. b. lung.
c. notochord. d. nerve tube. e. skin.
Which risk factor is associated with cancer of the colon and rectum?
A) tobacco B) viruses C) UV radiation D) dietary fat