Question

being lipid soluble, steroids can do all the following except
a enter the nucleus
b catalyze a reaction that produces cyclic amp (camp)
c bind to receptor proteins within the nucleus
d activate genes to transcribe mrna for protein synthesis
e diffuse through the plasma membranes of target cells
question 6
the percentage of erythrocytes in blood is known as the _.
a hematocrit
b plasma
c buffy coat
d hemoglobin
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Explanation:

• For the first question: Steroids are lipid - soluble. They can diffuse through the plasma membrane (as lipids can pass through the lipid - bilayer), enter the nucleus, bind to nuclear receptor proteins, and activate gene transcription for mRNA synthesis. However, the production of cyclic AMP (cAMP) is a second - messenger system typically associated with water - soluble hormones (not steroids).
• For the second question: Hematocrit is defined as the percentage of erythrocytes (red blood cells) in the blood. Plasma is the liquid component of blood, the buffy coat contains white blood cells and platelets, and hemoglobin is a protein in red blood cells.

Answer:

• First question: B. catalyze a reaction that produces cyclic AMP (cAMP)
• Second question: A. hematocrit