Which is NOT true regarding replication of Escherichia coli?
a. When growing optimally, a generation time of 20 minutes can be achieved.
b. It takes 40 minutes to replicate the chromosome.
c. Multiple replication forks allow for growth faster than the genome replication time.
d. Unidirectional replication of the chromosome occurs to allow rapid growth.
Answer: D
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Indicate whether the statement is true or false.
Select the correct meaning for the following pedigree symbol.
A) Unaffected male
B) Unaffected female
C) Mating
D) Affected male
E) Affected female
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.
Is it reasonable to conclude that the 45 kDa protein is involved in shell pigment production?
a. Yes b. No