A new orally administered medicine shows high permeability in its unionised form, but its absorption varies significantly along the gastrointestinal tract depending on local pH. The medicine is also known to be a substrate for P-glycoprotein efflux transporters. Which of the following best explains the combined mechanisms influencing the medicine’s movement across biological membranes?

An application for a first-in-human clinical study for an investigational biologic includes limited in vitro data and preliminary animal studies, but key toxicology studies (including repeat-dose toxicity and safety pharmacology) are incomplete. In addition, the manufacturing process has not yet been fully validated, and there is insufficient information on product stability and impurity profiles. From a regulatory and ethical standpoint, which of the following is the most appropriate position?

Which fungi produce mushrooms with gills?

If a tree lacked mycorrhizal fungi, what might occur?

A patient with malaria is treated for a protist infection.  Why is this unusual?

How do protists most commonly reproduce in stable environments?

Alternation of generation in protists involves:

Which group includes fungi that form mutualistic associations  with photosynthetic organisms?

Both protists and fungi include organisms that obtain nutrients from other sources rather than producing their own food.  However, they differ in how they do this.  Which scenario best demonstrates a key difference between protists and fungi in nutrient acquistion?

Why are protists considered essential to aquatic ecosystems?