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Which of the following processes does NOT use energy?

Which of the following is not used as a fuel source for glycolysis or the citric acid cycle.

What is NOT produced during the citric acid cycle?

What would happen to a plant cell if it is placed into a hypertonic solution?

Which of the following is NOT part of the endomembrane system?

Which of the following is involved in direct reversal of DNA damage?

Which of the following is NOT found in a typical plant cell?

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?