How Do Scientists Calibrate a Molecular Clock for a Group

question 63

Multiple Choice

How do scientists calibrate a molecular clock for a group of organisms with known nucleotide sequences?

• A)They analyze fossilized DNA of known age and compare its nucleotide sequences to modern DNA sequences.
• B)They graph the number of nucleotide differences against the dates of evolutionary branch points known from the fossil record.
• C)They use radioactive isotopes to measure the age of DNA material directly.
• D)They measure protein differences.Evolutionary rates in proteins are well- known and can be used to check results obtained using nucleotide sequences.

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Definitions:

Quick Response

A strategy in the retail industry to increase efficiency by replenishing products quickly based on consumer demand signals.

Overstock Quantity

Excess inventory that exceeds the demand for a product, often resulting in holding costs and potential markdowns.

Profits

are the financial gains that remain after all expenses, including costs of goods sold, operating expenses, and taxes, have been subtracted from a company's total revenue.

Cost of Understocking

Refers to the lost opportunity and sales a business incurs when it does not have enough inventory to meet demand.