The spontaneous mutation rate for autosomal genes can be estimated using the formula: number of de novo cases/________X.
A) 1
B) 2
C) 3
D) 4
B) 2
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In skin, the cells of the epidermis connect to the basal lamina through cellular junctions known as hemidesmosomes. Select the cytoskeletal filament that helps maintain the integrity of this connection
A. intermediate filaments B. microtubules C. microfilaments D. Responses a and c are both correct.
In cancer cells one allele of the tumor suppressor gene p53 is frequently mutated so that the protein is inactive, not produced, or deleted
The other allele will usually have a normal sequence and the promoter remains intact but the gene is not expressed. Sequencing with sodium bisulfite modification of DNA can be used to detect which cytosines are methylated. If the cancer cell DNA is sequenced what would be the anticipated results? A. Cytosines in or near the promoter region will be methylated B. Cytosines in or near the promoter will not be methylated C. Cytosines in the coding region will have an increased mehtylation D. There will be no differences in the methylation pattern of the promoter of p53 from a cancer cell and a normal cell
Both honeybees and birds have wings for flight; thus, these structures are homologous in the
two animal groups.
a. true, because the wings have a similar function and thus must be anatomically similar b. false, because the wings look very different between the two groups c. true, because all animals have a common ancestor d. false, because birds and honeybees do not share a common ancestor from which this trait was derived
In the absence of a nerve connection or electrical stimulation, can a muscle cell be made to contract in a laboratory
setting? Explain your answer. What will be an ideal response?