Biology 102 Chapter 27 – Flashcards
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Fission is an asexual process
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in which a parent separates into two individuals of approximately equal size.
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Hermaphrodites are animals that
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possess both male and female reproductive systems.
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Reproductive systems with external fertilization are most common in
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aquatic animals.
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Fertilization in the female reproductive tract typically occurs in the
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upper part of the oviduct.
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The embryo implants in the ________ of the uterus.
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endometrium
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After being produced in the testes, sperm mature further in a structure called the
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epididymis.
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Which of the following produces a thick fluid containing fructose, which is used for energy by sperm?
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seminal vesicles
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Which of the following hormones stimulates the growth of an ovarian follicle?
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FSH
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A decrease in ________ is followed by the gradual degradation of the corpus luteum.
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LH
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Which of the following agents can cause an infection that can ultimately develop into pelvic inflammatory disease in women?
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Chlamydia trachomatis
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Which of the following STDs is caused by a virus that can also cause cancer?
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genital warts
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Sterilization, in which the sperm is surgically prevented from reaching the egg, is accomplished by
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tubal ligation or vasectomy.
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The function of a sperm cell's acrosome is to
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carry enzymes that help the sperm cell's penetrate the egg.
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Which of the following generates the ATP that is required for movement of the sperm's tail?
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a mitochondrion in the neck and middle piece
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Which of the following serves as an impenetrable barrier that prevents more than one sperm from fertilizing an egg?
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the vitelline layer
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Which of the following events occurs first during embryonic development?
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cleavage
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Which of the following results from cleavage?
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formation of more cells
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Which of the following processes is most similar to the process of cleavage?
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slicing up a pie into eight pieces
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What occurs during gastrulation?
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A hollow blastula is changed into a hollow embryo that has three tissue layers.
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Which of the following options correctly represents the sequence in which most animals develop?
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zygote, cleavage, blastula, gastrula, organ formation
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When a chemical signal from a group of embryonic cells causes a different, nearby group of cells to embark on a particular developmental course (say, differentiating into a leg), the interaction between the two groups of cells is called
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induction.
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Cells migrate from one place to another during gastrulation using
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cellular protrusions.
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Which of the following describes apoptosis?
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programmed cell death
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The discovery of ________ explains embryonic pattern formation in a wide variety of organisms.
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homeotic genes
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Another term for gestation is
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pregnancy.
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When does the human blastocyst implant in the wall of the uterus?
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about a week after conception
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What would happen if the chorion failed to secrete human chorionic gonadotropin?
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The embryo would be aborted.
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Which of the following structures contributes to the structure of the placenta as well as completely surrounding the embryo?
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chorion
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At which gestational age does a developing human fetus first look obviously human and not like other vertebrate embryos?
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9 weeks
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Which of the following processes dominates the third trimester of human development?
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rapid growth
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Which of the following occurs during the process of labor
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positive feedback involving oxytocin and prostaglandins
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Contractions in uterine smooth muscle during labor are initiated by
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oxytocin.
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Which of the following options correctly lists the three stages of labor in the order in which they occur?
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dilation, expulsion, delivery of the placenta
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Which of the following statements regarding infertility and fertilization procedures is true?
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In IVF, fertilization occurs in a dish. The embryo is allowed to develop for several days, then the embryo is placed into the uterus.
