First Week of Development: Ovulation to Implantation Flashcards
Adult stem cells are multipotent, meaning they can differentiate into a wide range of cell types. They are scarce, making them difficult to isolate in sufficient numbers for experiments.
A) Both statements are true
B) Both statements are false
C) The first statement is true, and the second is false
D) The first statement is false, and the second is true
D) The first statement is false, and the second is true
What is the scar tissue formed from the degeneration of the corpus luteum if fertilization does not occur?
A) fimbriae
B) corpus luteum
C) corpus albicans
D) placenta
C) corpus albicans
What happens after the morula enters the uterine cavity?
A) It releases laminin and fibronectin
B) Fluid penetrates the zona pellucida
C) It attaches to the uterine mucosa
D) It floats around the uterine cavity
B) Fluid penetrates the zona pellucida
What happens to the corpus luteum if fertilization occurs?
A) It immediately degenerates
B) It continues to grow throughout pregnancy
C) It initially persists, then degenerates later in gestation
D) It transforms into the placenta
C) It initially persists, then degenerates later in gestation
What is the main function of the outer cell mass in a 16-cell morula?
A. It forms the embryo proper
B. It develops into the placenta
C. It contributes to the inner cell mass
D. It becomes the blastomere
B. It develops into the placenta
What is the correct order of follicle development during the ovarian cycle?
A. primordial, growing, graafian, vesicular
B. primordial, growing, vesicular, graafian
C. primordial, vesicular, growing, graafian
D. primordial, graafian, growing, vesicular
B. primordial, growing, vesicular, graafian
What technique involves injecting a single sperm directly into an egg and is used for severe male infertility?
A. Clomid
B. Assisted Reproductive Technology
C. In Vitro Fertilization
D. Intracytoplasmic Sperm Injection
D. Intracytoplasmic Sperm Injection
For the sperm to pass through the corona radiata of the egg, what process must it go through?
A. Capacitation of the sperm in the ovaries, which takes about 7 hours to complete, where its glycoprotein coat and seminal plasma proteins are removed from the plasma membrane over the acrosome region.
B. Capacitation of the sperm in the ovaries, which takes about 7 hours to complete. where its glycoprotein coat and seminal plasma proteins are removed from the plasma membrane over the acomere region.
C. Capacitation of the sperm in the uterine tube, which takes about 7 hours to complete. where its glycoprotein coat and seminal plasma proteins are removed from the plasma membrane over the acrosome region.
D. Capacitation of the sperm in the uterine tube, which takes about 7 hours to complete. where its glycoprotein coat and seminal plasma proteins are removed from the plasma membrane over the acromere region.
C. Capacitation of the sperm in the uterine tube, which takes about 7 hours to complete. where its glycoprotein coat and seminal plasma proteins are removed from the plasma membrane over the acrosome region.
15-20 egg-containing structures starts to grow during ovarian cycle with the help of?
A. Growth Factor 9
B. Luteinizing Hormone
C. Oocytes
D. Follicle-stimulating hormone
A. Growth Factor 9
Where does fertilization, the process by which male and female gametes fuse occur?
A. Cervix
B. Isthmus
C. Ampullary region of the uterine tube
D. Ovaries
C. Ampullary region of the uterine tube
What is considered the more ethical way of cloning embryonic stem cells?
A. Use of IVF embryos
B. Somatic Nuclear Transfer
C. Somatic Nucleated Transfer
D. Generating tissues through MDF
B. Somatic Nuclear Transfer
Which of the following correctly describes the layers formed during cell differentiation in early embryonic development?
A) Epiblast: Ventral layer, adjacent to the blastocyst cavity (blastocele).
B) Hypoblast: Dorsal layer.
C) Epiblast: Dorsal layer.
D) Hypoblast: Located on the dorsal side of the embryo.
C) Epiblast: Dorsal layer.
Which of the following processes is essential for sperm to penetrate the egg during fertilization?
A) Capacitation
B) Acrosome reaction
C) Both A and B
D) Neither A nor B
C) Both A and B
What is the role of the cortical and zona reactions in fertilization?
A. They help the sperm penetrate the egg.
B. They prevent polyspermy by making the oocyte membrane impenetrable.
C. They trigger the second meiotic division of the oocyte
D. They initiate the metabolic uniactivation of the egg
B. They prevent polyspermy by making the oocyte membrane impenetrable.
Estimates indicate that as many as 50% of pregnancies end in spontaneous abortions and that half of these losses are a result of chromosomal abnormalities. Without this phenomenon, approximately 15% instead of 5% to 6% of infants would have birth defects.
A. Both statements are true.
B. Both statements are false.
C. First statement is true, the second statement is false.
D. First statement is false, the second statement is true.
C. First statement is true, the second statement is false.
