1. Which molecule can diffuse from the digestive tract into the human bloodstream without first being digested? A) protein B) starch C) fat D) glucose 5. The pancreas, an organ which secretes enzymes directly into the intestine.helps A) break down food in the intestine B) prevent food from being digested in the intestine C) degrade the intestine D) preserve the structure of the intestine

1. **D) glucose**<br /><br />Glucose is a simple sugar (monosaccharide) that can be absorbed directly into the bloodstream from the digestive tract without needing further digestion. Proteins, starches, and fats are complex molecules that require enzymatic breakdown into smaller units before they can be absorbed.<br /><br />5. **A) break down food in the intestine**<br /><br />The pancreas produces several digestive enzymes, including amylase (for carbohydrates), lipase (for fats), and proteases (for proteins). These enzymes are released into the small intestine where they facilitate the chemical breakdown of food into smaller, absorbable molecules. The other options are incorrect; the pancreas aids digestion, doesn't degrade the intestine, and certainly doesn't prevent digestion.<br />