All of the following statements about genes and copy number variations are true EXCEPT
A. copy number variations have been associated with specific diseases.
B. individuals may differ as to the number of copies of a particular gene.
C. an individual's genome often contains multiple copies of a gene.
D. All of the answer choices are true.
Answer: D
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Which of the following is involved in B cell selection and tolerance?
A) clonal anergy B) clonal deletion C) clonal anergy and deletion D) allelic exclusion
DNA methylation of a gene during spermatogenesis would be most likely to result in
A. the inactivation of the paternal allele in the offspring. B. dosage compensation by the paternal allele. C. the inactivation of the maternal allele in the offspring. D. the inactivation of the X chromosome. E. dosage compensation by the maternal allele.
Suppose that an unknown organism from an alien planet is observed and found to have a diploid state in every other generation and to result from fertilization. The haploid state is able to grow into a gametophyte-like structure. Which life cycle strategies does this alien organism closely mimic?
a. those of all plants and some fungi b. those of fungi and algae c. those of algae and animals d. those of plants and animals
Of the four types of T helper cells, only ________ works to suppress immune cells
a. T reg b. Th1 c. Th2 d. Th17