Quiz: Everything About Embryo Development (Embryogenesis)
.
- 1.Which of the following statements concerning growing primary follicle is CORRECT?
- A.
The granulosa layer of cells secrete androgens
- B.
Fluid filled spaces appear between the granulosa layer of cells
- C.
The zona pellucida is absent
- D.
The theca externa layer of the cells rest on a basal lamina
- E.
The granulosa layer of cells rest on a basal lamina
- 2.Which of the following statements regarding Mature Graafian follicles is NOT CORRECT?
- A.
LH stimulates theca externa cell to produce and secrete estrogens
- B.
FSH stimulates SER of granulosa cells to transform androstenedione into estrogens
- C.
The corona radiata cells sends out cytoplasmic extensions thru the zona pellucida to the plasma membrane of the oocyte
- D.
LH stimulates theca interna cell to produce and secrete androstenedione
- E.
The LH surge causes ovulation of the oocytes
- 3.Which of the following statements regarding loose connective tissue is NOT CORRECT?
- A.
Tendon is an excellent example of loose connective tissue
- B.
Is found beneath epithelia as in the lamina propria
- C.
Has an abundance of cell types
- D.
Is found around blood vessels and glandular units
- E.
Has an abundance of ground substance within the tissue spaces
- 4.Which of the following statements concerning collagen biosynthesis is CORRECT?
- A.
Specific proteases remove the registration peptide outside the cytoplasm of the fibroblast cell
- B.
Hydroxylation of specific glycine residues takes place in the Golgi apparatus
- C.
Glycosylation of hydroxyglycine molecules occurs in the RER
- D.
Procollagen molecules are insoluble due to the registration peptide
- E.
The tropocollagen molecule is composed of only 2 polypeptide chains
- 5.Which of the following statements regarding glycosaminoglycans (GAG) is CORRECT?
- A.
Hyaluronic acid is regarded as a proteoglycan and not a GAG
- B.
Do not allow diffusion of water and soluble materials
- C.
Are composed of a core polysaccharide chain to which is attached several proteins
- D.
Have a high negative charge
- E.
Are not present in cartilage
- 6.Which of the following statements concerning an allergic reaction is CORRECT?
- A.
Antigens from pollen bind directly to mast cells causing them to secrete IgE antibodies
- B.
Antibody IgE binds to fibroblast cells
- C.
Adipose cells secrete IgG
- D.
IgE antibodies secreted by plasma cells binds to the surface of mast cells
- E.
Fibroblast cells secrete heparin and histamine
- 7.During the first six days of embryonic development:
- A.
The zona pellucida disappears around the 5 6 day stage of development
- B.
Blastomeres divide primarily by meiosis
- C.
The morula has acquired a cavity that is filled with fluid
- D.
Blastomeres at the 8 cell stage not only divide by mitosis but increase in size
- E.
The inner cell mass secretes human chorionic gonadotropin
- 8.During the second week of embryonic development:
- A.
The embryo proper is referred to as a bilaminar germ disc
- B.
The trophoblast layer forms the inner cell mass
- C.
The cytotrophoblast layer secretes luteinizing hormone
- D.
The amnion is connected to the hypoblast layer
- E.
Syncytiotrophoblast gives rise to the secondary yolk sac
- 9.The primitive uteroplacental circulation occurs as a result of
- A.
Syncytiotrophoblast cells eroding the lining of maternal blood vessels and allowing the blood to enter the lacunae (spaces)
- B.
Blood vessels developing in the wall of the yolk sac
- C.
Cytotrophoblast cells forming lacunae (spaces)
- D.
The inner cell mass developing blood vessels
- E.
Blood vessels forming in the extraembryonic mesoderm
- 10.At the time of ovulation, the developing egg is arrested at which stage of development?
- A.
Leptotene stage of meiosis I
- B.
Prophase 1 of meiosis 1
- C.
Zygotene stage of meiosis II
- D.
Diplotene stage of meiosis I
- E.
Metaphase stage of meiosis II
- 11.Which of the following cell types is present two years after birth?
- A.
Primary spermatocytes
- B.
Spermatids
- C.
Spermatogonia
- D.
Oogonia
- E.
Secondary oocytes
- 12.Which hormone is involved in the development of the uterus during the proliferative phase of the menstrual cycle?
- A.
Estrogen
- B.
Human chorionic gonadotropin (HCG)
- C.
Progesterone
- D.
Follicle stimulating hormone (FSH)
- E.
Luteinizing hormone (LH)
- 13.Which hormone is involved in the formation of the corpus luteum?
- A.
Follicle stimulating hormone
- B.
Activin
- C.
Progesterone
- D.
Luteinizing hormone
- E.
Human chorionic gonadotropin
- 14.Which of the following processes during fertilization is CORRECT regarding prevention of polyspermy?
- A.
The destruction of the zona pellucida by acrosin
- B.
Alteration of the oocyte plasma membrane and zona pellucida due to the release of enzymes from the cortical granules
- C.
Stabilization of the oocyte plasma membrane due to the release of enzymes from the cortical granules
- D.
Release of enzymes by the sperm resulting in the breakdown of the corona radiata
- E.
The widening of the perivitelline space between the oocyte plasma membrane and the zona pellucid
- 15.Which of the following processes is involved in the formation of the three germ layers?
- A.
Angiogenesis
- B.
Neural crest migration
- C.
Neurulation
- D.
Gastrulation
- E.
Invagination of endodermal cells
- 16.During the formation of the trilaminar embryo, ectoderm and mesoderm are derived from:
- A.
Chorion
- B.
Hypoblast
- C.
Amnioblasts
- D.
Epiblast
- E.
Exocoelomic (Heuser's) membrane
- 17.Which of the following statements regarding mesodermal cell migration is NOT CORRECT?
- A.
The intraembryonic mesoderm becomes continuous with the extraembryonic mesoderm
- B.
In front of the prochordal plate, the mesoderm forms the cardiogenic area
- C.
The mesodermal cells between the prochordal plate and primitive knot form the notochordal rod (tube)
- D.
Cells migrate in all regions between the epiblast and hypoblast
- E.
Mesodermal cells on either side of the notochord form the paraxial mesoderm
- 18.Which of the following structures is derived from the ectodermal germ layer?
- A.
The central nervous system
- B.
The lining of the respiratory tract
- C.
Muscle cells
- D.
Lining of the digestive tube
- E.
The kidney
- 19.The presence of cytokeratin in an analysis of a tumor would suggest that it is present in:
- A.
Mesenchyme
- B.
Neurons
- C.
Epithelium
- D.
Connective tissue
- E.
Endoderm
- 20.Which of the following contributes to epithelial polarity?
- A.
Presence of an intact basal lamina
- B.
Gap junctions
- C.
Membrane fluidity
- D.
Presence of desmosomes
- E.
Location of golgi apparatus near the nucleus
- 21.Which of the following is found primarily in the lamina densa of the basement membrane?
- A.
Entactin
- B.
Type IV collagen
- C.
Microfibrils
- D.
Laminin
- E.
Reticular fibers
- 22.Which of the following statements is CORRECT for epithelia?
- A.
They are incapable of performing absorptive functions
- B.
Certain types may contain apical specializations
- C.
They are surrounded by an abundance of extracellular matrix
- D.
They demonstrate weak adhesion between cells
- E.
They are highly vacularized
- 23.Which of the following statements BEST describes basal folds?
- A.
They possess cilia
- B.
They function in exocytosis
- C.
They are involved in lipid transport
- D.
They are associated with cells involved in active transport
- E.
They make up part of the terminal web
- 24.Plasma cells are derived from which of the following?
- A.
Macrophages
- B.
Fibroblast
- C.
T lymphocytes
- D.
Monocytes
- E.
B lymphocytes
- 25.On the basal side of the cell, the cytoskeleton of the cell communicates with the extracellular matrix across the plasma membrane by means of:
- A.
Cadherins
- B.
Integrins
- C.
Proteoglycans
- D.
Microtubules
- E.
Tonofilaments
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