SUFFOLK COUNTY COMMUNITY COLLEGE
Biology Department
Prof. L. Sabatino Exam #3
BY 70
Read each question carefully and choose the best answer from the choices given and record it in the blue book.
1. Which germ layers make up the stomodeum and proctodeum?
a) epi. ecto and splanchnic mesoderm b) neural ecto and mesoderm
c) epi. ecto and endoderm d) endoderm and splanchnic mesoderm
e) endoderm and somatic mesoderm
2. Which germ layers make up the primitive gut ( pharynx to large intestine)?
a) epi. ecto and splanchnic mesoderm b) neural ecto and mesoderm
c) epi. ecto and endoderm d) endoderm and splanchnic mesoderm
e) endoderm and somatic mesoderm
3. Which of the following develops from a branchial arch?
a) eustachian tube (auditory canal) b) stomodeum
c) the mandible d) teeth
4. The last pair of pharyngeal pouches develop the swim bladder in fish and the __________ in mammals.
a) liver b) stomach c) lungs d) umbilical cord e) proctodeum
5. Rotation of the gut during development leads to:
a) fusion of the dorsal and ventral pancreas
b) separation of the pancreas from the gallbladder
c) the fusion of the gallbladder and the umbilical cord
d) the formation of the hepatic portal vein
6. In mammals, the dorsal portion of the cloaca is the site for removal of:
a) feces b) urine c) gametes d) blood
7. At approximately the 6th week of human development, the small intestine:
a) starts blood production
b) is pushed into the umbilical cord due to the growth of the liver
c) forms the umbilical blood vessels
d) develops into the lungs
8. Which of the following does not form from the endodermal tube?
a) stomach b) lungs c) kidney d) trachea e) pancreas
9. Surfactant is:
a) produced before the alveoli of the lungs are fully formed
b) the secretion that is deficient in premature infants with Respiratory Distress Syndrome
c) necessary for the production of the gonads
d) what lines the umbilical cord
e) what stimulates the mesoderm in limb formation
10. Limb bud mesoderm stimulates the ectoderm to become:
a) AER b) connective tissue c) neural ectoderm d) splanchnic mesoderm e) endoderm
11. If duck leg mesoderm from the limb bud is combined with chick wing ectoderm from a limb bud, the resulting limb will be:
a) a chick leg b) a duck wing c) a duck leg d) a chick wing
12. Predict the results from the following experiment concerning programmed cell death.
Duck leg mesoderm from the limb bud is combined with chick wing ectoderm from a limb bud.
a) a chick wing will develop b) a chick leg will develop
c) a duck leg will develop d) a duck wing will develop
e) the entire limb will degenerate
13. Which of the following describes morphallaxis form of regeneration?
a) dedifferentiation, mitosis, redifferentiation b) restoring the pattern by adding new growth
c) dedifferentiation, redifferentiation, mitosis d) restoring the pattern before growth
e) a & d f) c & d
14. If a limb is denerved (removal of nerve) prior to epimorphosis, the limb will:
a) regenerate b) not regenerate c) be doubled d) only develop distally
15. Which of the following is a function of the Y chromosome?
a) provides the gene products for spermiogenesis
b) determines the fate of the indifferent gonads
c) determines the genetic sex
d) all of the above
16. Which of the following accurately describe Klinefelter's syndrome (XXY)?
a) male with testes that are sterile b) male with ovaries
c) pseudohermaphrodite d) hermaphrodite e) b & d
17. An hermaphrodite would form when:
a) ovarian and testicular tissue are present b) the Y chromosome is lost in a gonad
c) a female is expose to testosterone in utero d) a male doesn't produce testosterone
18.A female exposed to testosterone prior to birth (Congenital Adrenal Hyperplasia) would:
a) develop normally b) develop testes c) develop male external genitalia
d) have one testis and one ovary e) have an extra Y chromosome
19. The cortex of the metanephric kidney develops from the:
a) pronephric duct b) mesoderm surrounding the endodermal bud
c) epicardium d) AER of the limb bud
e) adrenal cortex
20. Once a cell has been programmed for cell death in limb formation:
a) nothing can stop it b) AER can stop degenerating
c) the DNA continues to replicate d) the epi. ecto becomes mesoderm
ESSAYS
15 pts. 1. Describe the development and evolutionary advantages of the pronephric, mesonephric and metanephric kidneys. Be sure to describe urine production in each.
10 pts 2. Predict and explain the results from the following experiment.
Be sure to include mutual induction.
Limb mesoderm from the neural stage is combined with ectoderm from a different limb bud.
15 pts. 3.a) Compare and contrast the development of the indifferent gonads, Mullerian Ducts, Wolffian Ducts, and external genitalia in males vs. females. Be sure to include the role of the Y chromosome, MDIH, and testosterone.
b) Explain the developmental abnormalities found in Turner's Syndrome (XO) and testicular feminization (insensitivity to testosterone).