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A cell does three main kinds of work.  They are chemical, mechanical, and:

Meselson and Stahl’s experiment examined the different models of DNA replication.  Below are the test tubes from the first replication cycle.  Which of the following test tubes would have provided evidence that the conservative model of DNA replication was the correct model for DNA replication?

HIV (Human Immunodeficiency Virus) infects a helper T cell by binding onto the CD4 membrane protein found on all helper T cells (a type of lymphocyte that is part of your immune system.)  However, to enter the cell, HIV also has to bind onto the CCR5 co-receptor protein.  There is much research now in creating a drug that blocks the binding of HIV to the CCR5.  Why?

In facilitated diffusion, the net movement of a molecules is:

The purpose of the citric acid cycle is to generate energy from the break down of the acetyl group that is taken into the cycle and convert the intermediary molecules in the cycle back to:

The active site on an enzyme can lower the activation energy in several ways.  Which of the following is not one of those ways?

Which of the following is a finding that became known as part of Chargaff’s rules?

True or False: Cells are open systems.  Since they are able to obtain nutrients and remove waste products, a cell’s metabolism can reach equilibrium with their surroundings.

Snowfall Enterprises produces a single product. During the current year, Snowfall had a beginning inventory of 13,000 units, produced 35,000 units, and sold 42,000 units. Snowfall’s current year costs are as follows:   Snowfall’s per-unit costs were the same in prior years. What is Snowfall’s ending inventory balance using variable costing? Round to the nearest whole dollar and do not enter a dollar sign (e.g., enter 89, not $89.00).

In the equation: ΔG = ΔH -TΔS, ΔS represents: