A protein is identified that starts a signal cascade leading to the activation of a gene that promotes cell division. This protein is coded for by a
a. oncogene.
b. tumor suppressor gene.
c. proto-oncogene.
d. carcinogen.
Ans: c. proto-oncogene.
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Adaptations to terrestrial environments evolved independently in arthropods, mollusks, nematodes, and annelids. What logical conclusion would you make from this statement?
A) All these groups have a coelom. B) The common ancestor of all these groups was probably aquatic. C) All these groups have the same type of body plan. D) All these groups lost their coelom after moving to land.
The reason segmental duplications pose a logistical challenge in the proper alignment of DNA sequences is that they
A. are inherently repetitive. B. contain large numbers of LINEs, which interfere with sequence annotation. C. interfere with BLAST analysis. D. are often found in areas of constitutive heterochromatin.
You have an F2 generation derived from two true-breeding parents AA and aa. with different characteristics for the same trait determined by a single allele
What percentage of the recessive phenotype would you expect to be true breeding if they were self-fertilized? A. 0% B. 25% C. 33% D. 67% E. 75% F. 100%
What unconsumed macromolecule from dead organisms eventually formed fossil fuels?
What will be an ideal response?