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NWHSU Mash GA2Q1E TF
NWHSU Mash GA 2 Quiz 1 Embryo True False
| Question | Answer |
|---|---|
| the haploid number of chromosomes is 23 pairs e. capacitation involves the removal of mucopolysaccharide coat | (false – 23 (not pairs)) (false – protein coat) |
| a. capacitation takes about 7 hours b. the 2n number of chromosomes is 23 c. the pre-embryonic period is weeks 1-3 | (true) (false – 46) (false – 1-2 weeks) |
| d. during the acrosome reaction hyaluronidase, etc. is released e. both male and female pronuclei replicate their DNA | (true) (true) |
| d. the acrosome reaction is the removal of a protein coat e. the cell membrane is the 2nd barrier a sperm must pass | (false – perforation of acrosome wall and release of hyaluronidase enzyme) (false – 3rd barrier: Corona Radiata, Zona Pellucida, Oocyte Cell Membrane) |
| d. the acrosome reaction is the removal of a protein coat from the sperm head e. the zona pellucida is the first barrier a sperm must penetrate | (false – capacitation, acrosome reaction is perforation of acrosome wall/protein coat and release of hyaluronidase enzyme) (false – corona radiate: Corona Radiata, Zona Pellucida, Oocyte Cell Membrane) |
| d. the zona reaction involves removal of a protein coat e. only about 200 to 300 million sperms reach the fertilization site | (false – capacitation) (false – 300-500) |
| the corona radiata is the first barrier a sperm must penetrate b. blastomeres is the name given to the cells during cleavage c. the blastocyst forms at about 3 days postfertilization ( | (true) (true) (false – 4-4.5 days, morula a ball of 12 blastomeres forms at 3 days post fertilization) |
| a.penetration of the oocyte cell membrane causes the oocyte to finish the 2nd meiotic division b.a morula forms at about 3 days postfertilization c.cleavage involves a series of cell divisions forming blastomeres | (true) (true) (true) |
| d. of the initial 200-300 million sperm only 3000-5000 reach the oocyte e. fertilization in the distal 1/3 of the uterine tube is best | (false – 300-500) (true) |
| d. of the initial 200-300 million sperm only 3000-5000 reach the oocyte e. one function of fertilization is the initiation of cleavage | (false – 300-500) (true) |
| a. penetration of the oocyte cell membrane causes the oocyte to finish the 2nd meiotic division b. the morula forms at about 4 to 4 ½ days c. the blastocyst may be a hollow ball of about 58 cells | (true) (false – 3 days! Blastocyst forms in 4 to 4 1/2 days) (true) |
| a. the diploid number of chromosomes is 23 b. union of male and female gametes starts at the embryonic period c. capacitation takes about 7 hours | (false – 46) (false – pre-embryonic) (true) |
| a. the diploid number of chromosomes is n b. capacitation involves perforation of the sperm head c. the zona pellucida is the 1st barrier a sperm must penetrate | (false – 2n) (false-capacitation is wall breakdown, acrosome reaction is perforation of acrosome wall/protein coat and release of hyaluronidase enzyme)(false – corona radiata: Corona Radiata, Zona Pellucida, Oocyte Cell Membrane) |
| female and male pronuclei replicate their DNA before forming a zygote e. the zona pellucida disappears during the blastocyst stage | (true) (true) |
| a. the blastocyst forms at about 4 to 4 ½ days of development b. the zona pellucida disappears when the blastocyst stage is reached c. female and male pronuclei replicate their DNA before forming zygote | (true) (true) (true) |
| a. one function of fertilization is the initiation of cleavage b. the zona reaction releases hyaluronidase and trypsin like enzymes c. about 300-500 million sperms reach the fertilization site | (true) (false – acrosome reaction) OR (penetration by additional sperm to zona pellucida becomes impossible) (false – 300-500) |
| d. cleavage involves a series of mitotic divisions e. the zona pellucida disappears before implantation | (true) (true) |
| d. a morula is a solid ball of about 12-16 cells e. cleavage involves a series of cell divisions forming blastomeres | (true) (true) |
| d.the blastocyst is a solid ball of about 12-16 cells e. the zona pellucida disappears before implantation | (false – morula, blastocyst is hollow ball with 58 cells) (true) |
| d. the blastocyst forms an embryoblast and trophoblast e. the morula consists of about 24 to 26 cells | (true) (false – 12-16 blastomeres) |
| d. the blastocyst implants at about 5 ½ to 6 days e. uteroplacental circulation begins as lacunae tap maternal sinusoids | (true) (true) |
| a. the blastocyst begins to form at 5 ½ to 6 days b. the zona pellucida disappears before implantation c. penetration of the oocyte cell membrane causes the oocyte to finish the 2nd meiotic division | (false – 4-4.5 days) (true) (true) |
| The blastocyst… a. is a ball of about 12-16 blastomeres b. has an inner cell mass termed the trophoblast c. is surrounded by the zona pellucida until the 7th day d. implants at 5 ½ - 6 days e. forms at 3 days postfertilization | (false -morula, blastocyst is hollow ball w/58 cells) (false -embryo last is inner, trophoblast is outer) (false -4 days) (true) (false -4 to 4 1/2 days) |
| a. the trophoblast forms the embryo proper (i.e., the body) b. the yolk sac is formed by an outer layer of endoderm c. a hydatidiform mole is a benign tumor from chorionic remnants | false – embryoblast) (false – inner layer) (true) |
| a. the syncytiotrophoblast gives rise to the cytotrophoblast (b. development of the trophoblast eventually forms most of the placenta and extraembryonic membranes c. the amnion is formed by an outer layer of amnioblasts | false – other way around) (true) (false – inner layer amnioblasts and outer layer extraembryonic somatopleuric mesoderm) |
| a. lacunae of synctiotrophoblast tap maternal sinusoids b. a hydatidiform mole is a benign tumor from chorion remnants c. the spleen develops from the intermediate mesoderm | (true) (true) (false – lateral plate) |
| the chorion has villi and forms most of the placenta e. a chorionepithelioma is a benign tumor from chorionic remnants | (true) (false – malignant) |
| the yolk sac has an inner layer of embryonic endoderm b. the amniotic cavity has an inner layer of extraembryonic somatopleuric mesoderm c. the chorionic cavity is also called the exocoelomic cavity | (false – inner: extraembryonic endoderm, outer:extraembryonic splanchnopleuric mesoderm) (false – inner:amnioblasts, outer:extraembryonic somatopleuric mesoderm) (false – yolk sac aka exocoelomic cavity) |
| c. the three germ layers are: epiblast, mesoblast, and hypoblast d. the trilaminar disc is formed during the 2nd week e. mesoblastic cells displace most of the hypobalstic cells | (false – embryonic ectoderm, intraembryonic mesoderm, embryonic endoderm: Embryoblast to hypoblast, Embryoblast to epiblast, Epiblast to Embryonic Ectoderm and mesoblast, Mesoblast to meso/endoderm) (false – 3rd week) (true) |
| d. embryonic endoderm forms mostly from the hypoblast e. remnants of the notochord may form a teratoma | (false – mesoblast) (false – primitive streak) |
| a. the hypoblast forms most embryonic mesoderm b. the yolk sac has an inner layer of embryonic endoderm c. a hydatiform mole is an invasive tumor which tunnels through the chorion components | (false – epiblast) (false – extraembryonic endoderm) (false – benign tumor) |
| a. the hypoblast forms most embryonic endoderm b. the chorionic cavity is also called the extraembryonic coelom c. teratomas develop from chorionic remnants | (false – mesoblast) (true) (false – develop from primitive streak remnants) |
| d. uteroplacental circulation involves maternal sinusoids and the cytotrophoblast e. the trilaminar embryonic disc develops during the 2nd week | (false – lacunae of syncytiotrophoblasts) (false – 3rd week) |
| a. lateral and cephalocaudal folding occur during the 3rd week b. gut formation and amniotic cavity surrounding the embryo are due to BOTH lateral and cephalocaudal folding c. in general the embryo has a caudocephalic gradient of differentiation | (false – 4th week) (true) (false – cephalocaudal) |
| a. the embryonic period begins at 3 weeks of development b. the diploid number of chromosomes is 23 c. the corona radiata is the 2nd barrier a sperm must penetrate | (true) (false – 46) (false – 1st barrier) |
| the notochord develops from cells at the caudal end of the streak d. the hypoblast forms little if any embryonic endoderm e. the trilaminar disc forms during the pre-embryonic period | (false) (true) (false – embryonic period) |
| a. cephalocaudal folding occurs primarily during the 3rd week b. the embryonic period is weeks 3-8 c. lateral and cephalocaudal folding causes part of yolk sac to form gut | (false – 4th week, lateral folding also occurs in 4th week) (true) (true) |
| d. the primitive node and pit give rise to the notochord e. the gestational period is 40 weeks from the last menstrual period | (true) (true) |
| Which ONE of the following statements is TRUE concerning the trilaminar embryonic disc? a. it forms during the 4th week b. the 3 germ layers are epiblast, mesoblast, and hypoblast | (false – 3rd week) (false – embryonic ectoderm, intraembryonic mesoderm, embryonic endoderm: Embryoblast to hypoblast, Embryoblast to epiblast, Epiblast to Embryonic Ectoderm and mesoblast, Mesoblast to meso/endoderm) |
| a. the trilaminar embryonic disc forms during the embryonic period b. chorionic remains may form teratomes c. lateral and cephalocaudal folding of the embryo occur in the 4th week | (true) (false - primitive streak may form teratomes) (true) |
| Which is true concerning the formation of the trilaminar disc? a. embryonic endoderm is mostly formed from the hypoblast b. the epiblast gives rise to embryonic ectoderm but not the mesoblast – | (false – mesoblast) (false -epiblast to embryonic ectoderm AND mesoblast) |
| a. morphogenesis occurs mainly during the fetal period b. the adrenal cortex develops from lateral plate mesoderm c. fusion of the vitelline duct and connecting stalk form the umbilical cord | (false – embryonic) (true) (true) |
| a. histogenesis occurs mostly during the fetal period b. the human gestational period is 40 weeks postfertilization c. morphogenesis occurs mostly during the embryonic period | (true) (false – 38 weeks) also (40 weeks last menstrual cycle) (true) |
| d. a hydatidiform mole is a malignant tumor formed from chorionic remnants e. the bilaminar embryonic disc forms during the first week of development | (false – benign tumor, chorionepithelioma is malignant) (false – 2nd week) |
| a. the fetal period is weeks 9-38 postfertilization b. taking on a human appearance is a characteristic of the fetal period c. lateral and cephalocaudal folding of the body occur in the 4th week | (true) (true) (true) |
| a. the spleen develops from intermediate mesoderm b. the epithelium of the lungs develops from endoderm c. the primitive pit and node give rise to the notochord | (false – lateral plate mesoderm) (true) (true) |
| d. the individual takes on a human appearance during the fetal period e. the spleen develops from lateral plate mesoderm | (true) (true) |
| d. the tonsils develop from ectoderm e. histogenesis occurs primarily during the embryonic period | (“the thyroid develops from lateral plate mesoderm” in another question) (false) (false – fetal period) |
| d. the urogenital system develops from the lateral plate mesoderm e. the embryonic period is the most critical of development | (false – intermediate mesoderm) (true) |
| d. the fetal period is 9-40 weeks postfertilization e. the yolk sac is also called the exocoelemic cavity | (false – from last menstruation) (true) |
| d. the gut develops from part of the yolk sac e. a characteristic of the fetal period is that the embryo takes on a human appearance | (true) (true) |
| d. the anterior pituitary is derived from ectoderm e. the human gestational period is 38 weeks postfertilization | (true) (true) |
Created by:
AnatomyMash
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