Problem:

Question 1: What organelle in a skeletal muscle cell stores then releases lots of calcium ions to trigger muscle contraction?

A. centriole

B. glycosome (glycogen granule)

C. nuclear envelope

D. smooth endoplasmic reticulum

E. Golgi apparatus

Question 2: Cytoskeleton: Circle the FALSE statement.

A. Microtubules are parts of centrioles.

B. Intermediate filaments are in the cytosol.

C. Actin microfilaments and intermediate filaments are hollow tubes, and are stretchy and elastic.

D. Actin microfilaments occur in all cells, but they are most abundant in muscle cells, where they are called thin filaments.

E. Microtubules and actin microfilaments interact with motor proteins, such as kinesins and myosin.

Question 3: In the cell nucleus, which of these has genes that are being transcribed by messenger RNA to read the genetic code?

A. extended chromatin

B. nuclear pores

C. nuclear envelope

D. condensed chromatin

E. proteins of the nucleolus

Question 4: Which one of these is NOT an example of segmentation in the human body, as we defined segmentation in class?

A. the spinal nerves that attach to the spinal cord (dorsal and ventral roots)

B. the 12 pairs of costal cartilages

C. the external intercostal muscles

D. the segments of the limbs, such as the arm, forearm, palm, and finger segments between finger joints

E. the dozens of intervertebral discs in the vertebral column

Please provide correct answer.