Which of the following statements is true? a. Plotting the rate of facilitated transport against substrates gives a sigmoidal curve b. Facilitated carrier proteins can be saturated by substrates c. Both A and B d. Neither A nor B

Which of the following is incorrect about chymotrypsin, trypsin, and elastase? a. They catalyze the hydrolysis of the peptide bond b. They have similar amino acid sequences and tertiary structures c. None; all the other choices are correct Od. They have different substrate binding sites

Downstream actions of enzymes generate C22:4 Δ 7,10,13,16 and C22:5 Δ 7,10,13,16,19, which are converted to final products C22:5 Δ 4,7,10,13,16 and C22:6 Δ 4,7,10,13,16,19 . a. Draw out the pathways described above. Provide accurate line drawings for each lipid described b. For each step, identify if an elongase and/or desaturase is used. If a desaturase is used, indicate the type (for example  9 desaturase). c. For each step indicate whether the parasite could be using an enzyme from the human host to complete the step. Briefly justify your choices. d. This pathway is being considered as a parasite-specific target for drugs (to treat parasitic infections). Which step would you choose to target and why?

If there was a molecule that causes Hb to be more stable in the T state, this molecule would:     a. Generally, raise the affinity of Hb for O2 b. Generally, lower the affinity of Hb for O2 c. Generally, cause Mb to favor the R state while Hb is in the T state d. Generally, cause Hb to dissociate into αβ dimers