Enzymes are proteins that help increase the rate of chemical reactions inside cells. These proteins are composed of many simpler molecules called amino acids. Which of the following suggests that the shape of
an enzyme determines the enzyme's function?

a) Enzymes are specific to a substrate

b) enzymes are activated by neighboring molecules

c) enzymes can be found in all life- forms.

d) enzymes can operate in a wide range of conditions

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.

Which organelle plays a role in intracellular digestion?

Choose the diagram that best represents a habitat corridor explain your choice.