In some forms of breast cancer, estrogen is a(n)
A) initiator.
B) promoter.
C) suppressor.
D) inhibitor.
E) mutagen.
Answer: B
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CpG islands are associated with which of the following?
A. Nucleosome location B. DNA methylation C. Steroid hormone activity D. cAMP pathway
Nitrogen has a higher electronegativity than hydrogen. As a result you would expect that ammonia (NH3) molecules can form ________ with each other.
A. hydrogen bonds B. ionic bonds C. hydrophilic bonds D. covalent bonds E. cohesive bonds
When a disease is said to have a multifactorial basis, it means that
A) many factors, both genetic and environmental, contribute to the disease. B) it is caused by a gene with a large number of alleles. C) it affects a large number of people. D) it has many different symptoms. E) it tends to skip a generation.
Which of the following statements about evolution is true?
A) Evolution can proceed to a limited extent without the occurrence of mutation. B) Evolution involves maintaining a constant frequency of alleles in the gene pool. C) Populations evolve. D) Individuals evolve.