Drier climates tend to prevail:a
on the windward side of mountains.
b. in a rain shadow.
c. close to the coast of the continent.
d. in temperate regions.
e. only in the northern hemisphere
B
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The traits that Mendel studied were most often influenced by single genes
A. true B. false
Name the process that takes place in nodules located on legumes
a. ammonification b. biological magnification c. denitrification d. nitrification e. nitrogen fixation
The COL1A1 gene in humans is responsible for producing collagens in healthy bone and cartilage. A mutation in COL1A1 is known to cause severe Osteogenesis Imperfecta, which is also known as "brittle bone disease," in which bones form irregularly and can break often, with even mild pressure and impacts. The mutation occurs as a "nonsense" mutation, dramatically shortening the proteins, occurring because the
The Human Genome Project is a multinational project that reported complete identification of more than 20,000 genes in human DNA. Growing understanding has associated "normal" and naturally variable versions of the genes, producing specific proteins for human health and cell functions. Numerous mutated versions of the genes have been associated with particular human health problems and disease, due to the types of cells where mutations occur, the specific genes affected, and the type and extent of mutation. In these cases, the structure and function of proteins is ultimately impacted. Examine these examples to apply your knowledge of mutations to the descriptions provided. A. codon that mutates causes a stop codon to occur instead of the placement of an amino acid. B. mutation is not in DNA. C. mutation does not occur in a codon. D. codon that mutates does not cause a change in the amino acid specified. E. codon that mutates causes a change in the amino acid specified.
You are an attending physician supervising a new resident. Together, you decide to treat a patient with a steroid drug. The resident administers the drug and watches the patient anxiously. "It's not working," he mutters. How do you respond?
A. "Let's grab a cup of coffee and then check again. Activating the G-protein coupled receptor and its downstream kinase cascade can take several minutes." B. "You're right, it doesn't seem to be working. Let's increase the dose, since we need to achieve high steroid levels in the blood." C. "Why don't you go on your rounds and come back? Steroid hormones need several hours to work, since they regulate gene expression. Transcription and translation take time." D. "We forgot to administer the carrier protein to get the drug across the cell membrane. We can add that now."