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Bio240 Chapter 46,47
Bio240 Chapter 46,47,40,21
| Question | Answer |
|---|---|
| What do budding and fragmentation have in common? | A) Both are types of asexual reproduction. |
| Why is sexual reproduction important? | B) The resulting diverse phenotypes may enhance survival of a population in a changing environment. |
| After sperm cells are produced, they are mainly stored in the | C) epididymis. |
| Where are human sperm cells produced? | C) the seminiferous tubules of the testes |
| Human fertility drugs increase the chance of multiple births, probably because they | b) mimic progesterone. |
| FSH stimulates: | b. maturation of ovarian follicles |
| In vertebrate animals, spermatogenesis and oogenesis differ, in that | C) oogenesis produces one functional ovum, whereas spermatogenesis produces four functional spermatozoa. |
| How do the estrous and menstrual cycles compare? | A) Endometrial bleeding occurs during the menstrual cycle; the endometrium is reabsorbed by the uterus during the estrous cycle. |
| The secretory phase of the menstrual cycle | C) corresponds with the luteal phase of the ovarian cycle. |
| What are the three phases of the ovarian cycle? | D) follicular, ovulation, and luteal |
| Inhibition of the release of GnRH from the hypothalamus will | C) inhibit secretion of gonadotropins from the pituitary. |
| One function of the corpus luteum is to | C) produce progesterone and estrogen. |
| What is the narrow opening of the human uterus called? | B) cervix |
| In humans, fertilization occurs in the ________, and implantation occurs in the ______. | d. oviduct, uterus |
| The membranous sac that forms from the hindgut and stores waste products in birds and reptiles is the: | c. allantois |
| The drug RU486 functions by | B) blocking progesterone receptors in the uterus. |
| Which of the following is a function of the contents of the acrosome during fertilization? | C) to digest the exterior coats of the egg |
| The cortical reaction functions directly in the | A) formation of a fertilization envelope. |
| Which structure in bird and mammalian embryos functions like the blastopore of frog embryos? | primitive streak |
| The development of an organism is controlled by | d. all of the above |
| As cleavage continues during frog development, the number of blastomeres | A) increases as the size of the blastomeres decreases. |
| Which region of the frog blastula corresponds to the future dorsal side of the embryo? | D) gray crescent |
| Which developmental sequence is CORRECT? | D) cleavage, morula, blastula, and gastrula |
| the time of implantation, the human embryo is called a(n) | B) zygote. |
| The yolk of the frog egg | E) leads to unequal rates of cleavage for the animal pole compared to the vegetal pole. |
| After gastrulation, the outer-to-inner sequence of tissue layers in a vertebrate is | c) ectoderm, mesoderm, endoderm. |
| What is the process called that involves the movement of cells into new relative positions in an embryo and results in the establishment of three germ tissue layers? | E) gastrulation |
| Without the formulation of an ectoderm, vertebrates would not form | A) a nervous system. |
| You observe an embryo with meroblastic cleavage, extraembryonic membranes, and a primitive streak. How would you identify this organism, based on the information given? | D) bird |
| Hans Spemann has referred to which of the following structures as the primary organizer in the early development of amphibian embryos? | E) dorsal lip of the blastopore |
| During gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the | A) notochord. |
| The posterior portion of the neural tube will develop into the frog's | A) spinal cord. |
| An increase in which of the following parameters is most important in the evolution of specialized exchange surfaces such as the linings of the lungs or intestines? | A) surface area |
| Collagenous fibers are primarily found in what type of animal tissue? | A) connective |
| Why must multicellular organisms keep their cells awash in an "internal pond"? | B) Cells need an aqueous medium for the exchange of nutrients, gases, and wastes. |
| Muscles are joined to bones by | D) tendons. |
| The epithelium best adapted for a body surface subject to abrasion is | E) stratified squamous. |
| Which muscle tissue is responsible for voluntary movement? | B) skeletal muscle only |
| The involuntary muscles that cause the wavelike contractions pushing food along our intestines are | D) smooth muscles. |
| A group of similar specialized cells, organized as a structural and functional unit is a(n): | b. tissue |
| Which of the following is true of interstitial fluid? | D) It provides for the exchange of materials between blood and body cells. |
| How does positive feedback differ from negative feedback? | B) In positive feedback, the effector's response is in the same direction as the initiating stimulus rather than opposite to it. |
| Which of the following is an important distinction between the measurement of basal metabolic rate (BMR) and standard metabolic rate (SMR)? | C) SMRs must be determined at a specific temperature. |
| In an amphibian embryo, a band of cells called the neural crest | C) produces cells that migrate to form teeth, skull bones, and other structures in the embryo. |
| The body's automatic tendency to maintain a constant internal environment is termed | A) homeostasis. |
| Multinucleate cells are found in: | d. skeletal muscle cells |
| Terrestrial animals mainly exchange heat with the environment by all of the following physical processes except | D) illumination. |
| Consider an ectotherm and an endotherm of equal body size. The ectotherm is more likely to survive an extended period of food deprivation than the endotherm because | E) both B and C |
| Where is the thermostat of vertebrates located? | C) hypothalamus |
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Liwa91
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