Actual review questions Flashcards
During oogenesis there are two meiotic arrests. The first meiotic arrest occurs at which of the following stages of meiosis?
a. Diplotene stage of prophase 1
b. Diakinesis stage of prophase 1
c. Metaphase 1
d. Anaphase 1
e. Metaphase 2
A- diplotene stage of prophase 1
Primordial germ cells migrate from their point of origin in the very early embryo into the developing gonads. In mammalian embryos and many other vertebrate embryos, the primordial germ cells originate from and are first observed in which of the following locations?
a. hindgut
b. dorsal mesentery
c. primitive streak
d. tolk sac
e. chorion
d. yolk sac
Which of the following best describes the oogonium in the ovary during the early fetal period?
a. Haploid oogonium with a single layer of cuboidal cells
b. Diploid oogonium with no follicle cells
c. haploid oogonium with no follicle cells
d. diploid oogonium with a few flattened follicle cells
b. diploid oogonium with no follicle cells
In meiosis, pairing of homologous chromosomes begins in which of the following stages of prophase 1?
a. leptotene
b. zygotene
c. pachytene
d. diplotene
b. zygotene
Which of the following refers to the process by which a cell or part of an embryo becomes restricted to a given developmental pathway?
a. morphogenesis
b. differentiation
c. ontogeny
d. determination
d-determination
After the first meiotic arrest, the secondary oocyte resumes meiosis at the time of ovulation. this resumption of meiosis is enabled by the closure of gap junctions between granulosa cells and the oocyte, resulting in a reduction in the flow of cAMP into the oocyte. Which of the following is responsible for shutting the gap junctions?
a. LH
b. FSH
c. Progesterone
d. estrogen
a. LH
Capacitation involves the removal of cholesterol glycoproteins from the sperm surface. It is necessary for the sperm to fertilize the egg. Capacitation occurs in which of the following locations?
a. isthmus of the oviduct
b. ampulla of the oviduct
c. epididymis
d. Vas deferens
a. isthmus of the oviduct
The principal energy source for ejaculated spermatozoa is
a. Prostatic acid phosphatase
b. Internal glucose
c. Prostate citric acid
d. Fructose in seminal vesicle fluid
e. Glycogen released from the vaginal epithelium
d. fructose
Of the barriers to sperm survival and transport with in the female reproductive tract, low pH is most important in the
a. Upper uterine tube
b. Lower uterine tube
c. Uterine cavity
d. Cervix
e. Vagina
e. vagina
What is the most common condition associated with spontaneous aborted embryos?
a. Maternal imprinting
b. Paternal imprinting
c. Ectopic pregnancy
d. Chromosomal abnormalities
e. Lack of X chromosome inactivation
d. chromosomal abnormalities
What tissue from the implanting embryo directly interferes with the endometrial connective tissue?
a. Corona radiata
b. Inner mass cells
c. Extraembryonic mesoderm
d. Epiblast
e. Syncytiotrophoblast
e. syn…
Identical twinning is made possible by what process or property of the early embryo?
a. Regulation
b. Aneuploidy
c. Paternal imprinting
d. Maternal imprinting
e. X-chromosomal inactivation
a. regulation
The zona pellucida:
a. Aids in penetration of the endometrial epithelium
b. Serve as a source of nutrients for the embryo
c. Prevents premature implantation of the cleaving embryo
d. All of the above
e. None of the above
c-prevents premature implantation of the cleaving embryo
Which of the following signaling pathways is often involved in lateral inhibition?
a. Hedgehog
b. Delta notch
c. Wnt
d. Receptor tyrosine kinase
e. Retinol
b-delta notch
TGF-B often utilizes which of the following kinds of pathways?
a. Hedgehog
b. Delta Notch
c. Wnt
d. Receptor tyrosine kinase
e. Retinol
d. receptor tyrosine kinase
