Organic molecules that increase the rate of chemical reactions, such as condensation and hydrolysis, without being changed in the process are known as ____.

A) enzymes
B) metabolites
C) denaturating agents
D) hydrocarbons
E) prions

This region of the brain perceives sensory input and controls motor output.

A) cerebrum
B) hypothalamus
C) limbic system
D) cerebellum
E) medulla oblongata

How do leeches differ from other annelids?

A) They are aquatic.
B) They do not have segmentation.
C) They cannot reproduce sexually.
D) They do not have a nervous system.
E) They do not have setae or parapodia.

The extracellular matrix is responsible for which of the following features?

A) The extracellular matrix helps the cell resist stretching.
B) The extracellular matrix enables the cell to adhere to neighboring cells.
C) The extracellular matrix plays a role in cell signaling.
D) The extracellular matrix acts as a structural feature.
E) All of the answer choices are correct.