What was the purpose of the vinegar in the third trial?

1. test the effect of raising pH on enzyme action

2. test the effect of lowering pH on enzyme action

3. serve as a control

4. served no purpose

The five basic stages of sleep are further classified into two distinct orders characterized by

3. In one population, 18 individuals have long hair and 182 individuals have short hair. It is known thatmating has been random with respect to hair length for several generations. (a) What are the hair length allele frequencies in this population?

The statements below are steps of DNA replication. Rearrange the statements so they are in order with the first step at the top. Two DNA strands are synthesized that are complementary to each original strand.

Functionalists would view gender roles in which of the following ways? Gender roles assist in keeping women oppressed within the family structure. Gender roles have a bias towards male power. Gender roles are necessary to keep the family in balance.

Describe the 4 combinations of active or inactive regulatory proteins that could be present at any time in the cell

Suppose you use a microscope to look at a cell from the leaf of a tree. What structure will you see that would not be found in a cell from your fingernail? A. mitochondria B. cilia C. cell wall D. ribosomes

Name the three energy roles that organisms fill in an ecosystem.

Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. True False

Which of the following are examples of the first specialized tissues?

Which structure of the trachea prevents it from collapsing inward and obstructing the air passageway?