Hair cells in the vertebrate ear are responsible for transducing sound pressure waves. Ion channels in the hair cell membrane open when _____
A) a chemical ligand binds to the ion channel
B) light is absorbed by a molecule in the membrane
C) the cell membrane reaches a threshold voltage
D) the membrane is distorted mechanically
Answer: D
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When considering complex traits in health and disease, which of the following statements is not correct?
A. Diabetes, high blood pressure, asthma, epilepsy, schizophrenia, and clinical depression are all complex traits. B. Cystic fibrosis, sickle-cell anemia, and phenylketonuria are simple Mendelian disorders. C. The majority of birth anomalies result only from genetic risk factors. D. Many genes that contribute to complex traits are clustered on the same chromosome. E. Many genes that contribute to complex traits arose through the process of duplication of a single gene followed by divergence over time, generating a family of genes near one another with related functions.
Where can you find the most genetically diverse populations of humans?
A) Europe B) Central America C) Africa D) Pacific Islands
While on the voyage of the HMS Beagle, Darwin:
a) wrote Origin of Species. b) studied Malthus's book Essay on the Principle of Population. c) discovered a love of sea travel. d) corresponded extensively with Alfred Russel Wallace about their ideas on evolution. e) nurtured his love of studying nature, exploring plant and animal diversity, and collecting fossils.
The inheritance of the petite phenotype in Saccharomyces cerevisiae is complicated by an interaction of mitochondrial and nuclear genes. Which of the following is a false statement about petites in S. cerevisiae?
A) Segregational petites are characterized by mutations in the nuclear genome. B) Suppressive petites are characterized by mitochondria lacking most of its DNA. C) Neutral petites, when crossed to wild type, yield wild-type mitochondrial function. D) The three categories of petites are segregational, neutral, and suppressive. E) Both nuclear and cytoplasmic (mitochondrial) genes contribute to the petite phenotype in some cases.