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Proteins known as cyclins (named because their concentration increases and decreases in a regular pattern through the cell cycle) and enzymes known as cyclin-dependent kinases (Cdks) are the key components in the regulatory events that occur at checkpoints. At the G1 to S checkpoint, two different G1 cyclin/Cdk complexes form, […]

Q1. About 5 percent of individuals with Down syndrome have a chromosomal translocation in which a third copy of chromosome 21 is attached to chromosome 14. If this translocation occurred in a parent’s gonad, how can it lead to Down syndrome in a child? Q2. During a physical exam a […]

Climate Change Response Some people you know say they don’t believe that the climate is changing. After this week’s readings, how would you respond? Write a 525- to 700-word response including: How scientists learn about past global temperatures and climates. The greenhouse effect. Greenhouse gases and their role in current climate […]

1) In this problem we examine the effects of interactions among predators on the stability of a predator-prey system. We will modify the basic Lotka-Volterra model without density dependence in the prey. We will be changing the assumption that the per predator predation rate is independent of the number of […]