The four primary tissue types are

A) epithelial, cartilage, muscle, and brain.
B) connective, epithelial, skin, and blood.
C) epithelial, connective, muscle, and nervous.
D) glands, bone, lungs, and kidney.
E) bone, skin, blood, and muscle.

What forms the contractile ring in animal cells?

A) membrane vesicles
B) actin filaments
C) cellulose fibrils
D) cell wall
E) histones

Tubular reabsorption and tubular secretion differ in that

A) tubular secretion is a passive process; tubular reabsorption uses active transport.
B) tubular secretion adds materials to the filtrate; tubular reabsorption removes materials from the filtrate.
C) tubular reabsorption increases urine volume; tubular secretion decreases urine volume.
D) tubular reabsorption occurs in Bowman capsule; tubular secretion occurs in the peritubular capillary.
E) tubular secretion moves materials from the filtrate into the blood; tubular reabsorption moves materials from the blood into the filtrate.

_______ allows these polyploid, sterile plants to reproduce and therefore survive.

A) Fertilization
B) Mitosis
C) Apomixis
D) Abscission
E) Budding

Which of the following is an agranulocyte?

A) Eosinophil
B) Basophil
C) Neutrophil
D) Monocyte
E) Erythrocyte

Most of the ventricle filling occurs ________.

A) during atrial systole
B) when the AV valve is closed
C) during ventricular systole
D) during atrial diastole
E) during isovolumetric contraction

Which of the following countries has the lowest union density rate?

A) United Kingdom
B) United States
C) Canada
D) Sweden

Jack broke his right leg in a football accident. He has had a cast on for about 2 months. Now that the cast is off, Jack has found that his right calf is significantly smaller than his left calf. Why is this?

A) The unused right calf atrophied.
B) When you break a bone, the attached muscle is also torn. Therefore, it gets smaller.
C) Calf muscles are composed of fast-twitch fibers and tend to grow larger over time.
D) The left calf probably hypertrophied in compensating for the broken leg during walking.
E) This is highly unusual and suggests some type of muscle disease.

Mammals are the only vertebrates that possess ____.

A) teeth
B) a backbone
C) a brain
D) a four chambered heart
E) mammary glands