Which of the following types of genetic material undergo recombination during meiosis?
a. sister chromatids
b. sister chromatids and homologous chromosomes
c. all four chromatid
d. homologous chromatids
Answer: d. homologous chromatids
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Amniocentesis is not performed on mothers over the age of thirty-five
a. True b. False Indicate whether the statement is true or false
High ____ concentrations in Lake Erie encouraged the growth of photosynthetic algae, which changed the
phytoplankton community.
a. sewage b. detergent c. coliform bacteria d. phosphorous e. dead fish
In cancer cells, how are promoter regions silenced?
a. Histone acetylation makes DNA inaccessible. b. Repressors bind to the promoter region making it inaccessible to RNA polymerase. c. Methylation of cytosine DNA residues in CpG islands silences promoter regions. d. Promoters are excised by exonuclease.
Which of the following muscles contract during forceful exhalation?
a. the diaphragm b. external intercostals c. internal intercostals d. the diaphragm and external intercostals e. the diaphragm and internal intercostals