Question 18 of 30 3.33/ 3.33 Points

The neural tube of vertebrates develops during morphogenesis of the nervous system by the:

A. Fusion of ectoderm and mesoderm

B. Folding of ectoderm tissue

C. Contraction of the endoderm away from the mesoderm

D. Fusion of endoderm and mesoderm

E. Migration of mesoderm cells

Question 19 of 30 3.33/ 3.33 Points

This figure shows the late gastrula stage in frog development. What does “a” represent?

A. Endoderm

B. Yolk plug

C. Primitive gut

D. Ectoderm

E. Mesoderm

Question 20 of 30 3.33/ 3.33 Points

Which hormone stimulates and maintains the secondary sexual characteristics in males at puberty?

A. Testosterone



D. Estrogen


Question 21 of 30 3.33/ 3.33 Points

In the lab simulation some organs of the digestive system were removed in order to observe other organ systems. What organ was not removed?

A. Liver, gall bladder, and pancreas

B. Heart

C. Large and small intestine

D. Stomach

Question 22 of 30 3.33/ 3.33 Points

Before you can observe the interior of the frog’s mouth you need to:

A. Prop open the mouth with a toothpick

B. Cut the frog’s jaw

C. Remove the skin on the head

D. Cut the ventral skin anteriorly to the jaw

Question 23 of 30 3.33/ 3.33 Points

In what organ is digestion completed?

A. Liver

B. Stomach

C. Small intestine

D. Cloaca

Question 24 of 30 3.33/ 3.33 Points

Which of the following structures cannot be seen on the inside of the frog’s mouth?

A. Vomerine teeth

B. Stomach

C. Glottis

D. Opening to the esophagus

Question 25 of 30 3.33/ 3.33 Points

What are the two most anterior lobes of the frog brain that can be seen under the skull bone?

A. Cerebellum

B. Olfactory

C. Cerebrum

D. Optic lobes

Question 26 of 30 0.0/ 3.33 Points

Which of the following is not true about the appendicular region of the frog skeleton?

A. Is made up of the wrist ankle and toes of the limbs

B. Includes the skull

C. Is composed of 112 bones

D. Comprises the fore limbs and the hind limbs

Question 27 of 30 3.33/ 3.33 Points

Both the human and frog livers produce what substance that aids in digestion?

A. Phosphate buffers

B. Amylase

C. Bile

D. Saliva

Question 28 of 30 3.33/ 3.33 Points

Which of the following describes the glottis?

A. It contains the two vomerine teeth

B.It is a passage of air to the outside

C. It leads to the stomach

D. It is the opening to the frog’s respiratory system

Question 29 of 30 3.33/ 3.33 Points

Why are frogs classified as amphibians?

Question 30 of 30 3.33/ 3.33 Points


Name and describe the function of the small slit at the posterior end of the frog’s body.

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