Problem:

Question 1: Which of these features is NOT present in all the vertebrate animals?

A. notochord

B. the spinal cord and brain

C. limbs with digits (fingers and toes)

D. heart in the ventral thorax

E. pharyngeal slits or pouches

Question 2: Which medical imaging procedure is both the safest and easiest to use (shortest preparation time, least complicated for the patient)?

A.PET

B.MRI

C.full-body CT scan

D.ultrasonography

Question 3: In a lecture this year, Dr. Mallatt said that your lecture notes on Medical Imaging are outdated in one way. What is the new advance that made your notes outdated?

A. No physician uses palpation in physical exams any more.

B. PET is no longer used because it harms patients with radioactivity.

C. No traditional X-ray imaging is done any more.

D. Due to faster computers, ultrasonography and other techniques can now produce sharper, 3-D images, even reconstructing organs moving in real time.

E. CT images of soft structures are now as sharp as MRI images of

these soft structures.

Question 4: Early in week 3 of development, what does NOT happen at the primitive streak (or primitive node)?

A. the mesoderm forms

B. the notochord forms

C. the endoderm forms

D. the neural tube forms

E. the epiblast migrates in through the streak

Give reasoning with your answer.