Kindly answer the multiple choice questions below. 1. Which of the following is
ID: 200382 • Letter: K
Question
Kindly answer the multiple choice questions below.
1. Which of the following is true of the zona pellucida?
a. It is an acellular layer composed of three glycoproteins zp1,zp2 and zp3
b. It is responsible for inducing the acrosome reaction in sea urchin sperm
c. ZP2 is the spermreceptor, while ZP3 binds acrosome reacted sperm.
d. It is composed of fertilin and resact.
e. It is raised in response to fertilization and consttutes the fertilization envelope
f. None of the above
2. Which of the following is true of cortical granule exocytosis?
a. It requires K influx from extracellular sources
b. It is controlled by a change in the membrane potential of the sperm plasma membrane.
c. Ionophore A23187 treatment of oocytes could influence this process
d. It is the fast block to polyspermy
3. Which of the following is true of the role of the Golgi aparatus as it relates to spemiogenesis?
a. Modification of the Golgi results in the formation of the acrosome, a structuree containing hydrolytic enzymes which facilitate sperm movement through the zona pellucida.
b. If the Golgi membrane is malformed, sperm funtion may be compromised
c. That portion of the Golgi not incorporated into sperm head is discarded
d. The inner and outer acrosomal membrane are derived from the membrane f the Golgi apaparatus.
e. All of the above
f. None of the above.
14. Good candidates for ZIFT include which of the following?
a. Women who have had extensive fallopian tube scarring.
b. Women who have endometriosis or explained infertility
c. Women who have had multiple miscarriages.
d. None of the above.
Explanation / Answer
1) a. It is an acellular layer composed of three glycoproteins zp1,zp2 and zp3 found aroud the plasma membrane of mammalian oocyte. ZP3 allows species-specific sperm binding ZP2 mediates subsequent sperm binding and ZP1 coonects ZP2 and 3
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