The muscles that laterally rotate and depress the scapula, as in shrugging and lowering the shoulders, are the ________.

A) trapezius and serratus anterior
B) pectoralis minor and serratus anterior
C) levator scapulae and rhomboideus
D) trapezius and rhomboideus
E) trapezius and latissimus dorsi

interacts with bone to facilitate movement

A) skeletal muscle
B) smooth muscle
C) cardiac muscle

Many Canadian workers are represented by U.S. unions in their dealings with their employer.

Which level of primary control in eukaryotic gene activity involves methylation and chromatin packing as a way to keep genes turned off?

A) pretranscriptional control
B) transcriptional control
C) posttranscriptional control
D) translational control
E) posttranslational control

In the experiments of Griffith, the conversion of nonlethal R-strain bacteria to lethal S-strain bacteria

A) was due to genetic mutation.
B) was due to transformation.
C) proved that proteins are the genetic material.
D) could not be reproduced by other researchers.
E) was similar to experiments performed by Watson and Crick.

Imagine the following scenario:
Blood pressure decreases below normal levels.→ Blood flow to the heart decreases → Heart is unable to pump as much blood.→ Blood pressure decreases even more.
This is an example of ________ feedback.

A) positive
B) negative