Exam 27: Reproduction and Embryonic Development

The embryo normally implants in the

Which of the following processes dominates the third trimester of human development?

The acrosome of sperm cells contains an enzyme called hyaluronidase. Which of the following procedures would benefit from the addition of hyaluronidase?

The yolk sac of humans

What would happen if the chorion failed to secrete human chorionic gonadotropin?

Fission is an asexual process

The human embryo's first blood cells arise in the

Apoptosis can be described as

Which is not a potential advantage of asexual reproduction?

The function of a sperm cell's acrosome is to

-Which part would be cut when a sterilization procedure (vasectomy) is performed?

A decrease in ________ is followed by the gradual degradation of the corpus luteum.

Meconium is the clinical term used for the earliest stool (fecal matter) of a newborn human infant, which is usually very sticky (like tar), almost completely odorless, and dark olive green in color. Meconium takes this form due to materials that the fetus orally ingests while in the uterus. Which of the following materials would the fetus likely ingest during development?

What occurs during gastrulation?

Home pregnancy test kits can detect whether a woman is pregnant within 1 to 3 weeks of her egg being fertilized. The test kits include a short strip of paper that extends from a plastic case. After a woman urinates on the strip of paper and waits 3 to 5 minutes, a symbol is displayed on a small window in the plastic case. Some tests show a single line to indicate the woman is not pregnant (negative result) and two lines to indicate she is pregnant (positive result). Others show a minus or plus sign (or some other variation) to indicate negative and positive results. The test reports a positive symbol if it detects the presence of HCG in the woman's urine. In order for HCG to be detected, it must be present in the urine at a concentration of at least 10 to 100 units per milliliter. Even though home pregnancy tests are well designed and have been tested extensively, false negative and false positive results do occur. A false positive occurs when a test tells a woman that she is pregnant when she really is not, and a false negative occurs when a test tells a woman that she is not pregnant when she really is. Most home pregnancy test kit manufacturers claim that their tests are over 99% accurate. -If you were designing a home pregnancy test kit, which of the following statements would you include in the instructions in an attempt to minimize false positive results?

Your friend tells you that as long as you can track the exact day that a woman ovulates, and as long as a woman does not have sexual intercourse on this day, then she will not get pregnant even if no form of contraception is used. Is your friend correct? Why or why not?

Which structure is part of the placenta and completely surrounds the embryo?

The body cells of a turkey have 80 chromosomes each. How many chromosomes would be found in a male turkey's sperm cells?

Which process occurs during cellular migration and development into specialized tissue?

Which structure serves as an impenetrable barrier that prevents more than one sperm from fertilizing an egg?