DAT Practice Test (Survey of Natural Sciences) 5

Question 1

Which macromolecule serves as the primary structural component of cell membranes?

Accepted Answer

Phospholipids

Answer

Phospholipids form the bilayer that makes up cell membranes.

Question 2

What is the product when an acid reacts with a base?

Accepted Answer

Salt and water

Answer

Neutralization reactions produce a salt and water.

Question 3

Which part of the neuron receives signals from other neurons?

Accepted Answer

Dendrites

Answer

Dendrites receive incoming signals and conduct them toward the cell body.

Question 4

How many electrons can the second principal energy level (n=2) hold?

Accepted Answer

8

Answer

The n=2 level has s and p subshells holding a maximum of 8 electrons.

Question 5

Which type of selection favors extreme phenotypes at both ends of a trait range?

Accepted Answer

Disruptive selection

Answer

Disruptive selection favors both extremes over intermediate phenotypes.