Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Textbook Question
Chapter 42, Problem 6SQ
The ________, a fluid-filled sac, surrounds and protects a human embryo and keeps it from drying out.
- a. amnion
- b. yolk sac
- c. allantois
- d. chorion
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Chapter 42 Solutions
Biology: The Unity and Diversity of Life
Ch. 42 - Prob. 1DAACh. 42 - Prob. 2DAACh. 42 - Prob. 3DAACh. 42 - Prob. 4DAACh. 42 - The end product of cleavage is a __________. a....Ch. 42 - The outermost germ layer in a vertebrate gastrula...Ch. 42 - Prob. 3SQCh. 42 - Prob. 4SQCh. 42 - In humans, fertilization typically occurs in the...Ch. 42 - The ________, a fluid-filled sac, surrounds and...
Ch. 42 - The placenta consists of __________. a. embryonic...Ch. 42 - During the fetal period, ____________. a....Ch. 42 - Prob. 9SQCh. 42 - Match each hormone with its action(s). ______...Ch. 42 - Prob. 11SQCh. 42 - Prob. 12SQCh. 42 - Prob. 13SQCh. 42 - Prob. 14SQCh. 42 - Place these events in human development in the...Ch. 42 - The rubella virus causes German measles. If a...Ch. 42 - A nursing mother who has an alcoholic drink...Ch. 42 - To determine the effect of the bicoid gene,...Ch. 42 - If an embryo splits at the two-cell stage, each of...
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- During embryonic development, unique cell layers develop into specific groups of tissues or organs during a stage called ________. a. the blastula stage b. the germ layer stage c. the gastrula stage d. the organogenesis stagearrow_forwardLayer A is called _____X________, and ______Y________ develops from this layer. Select one: a. X Y Ectoderm Nervous system b. X Y Endoderm Nervous system c. X Y Endoderm Lining of the digestive tract d. X Y Ectoderm Lining of the digestive tractarrow_forwardIn the development of amniotes (reptiles, birds, mammals), the defining feature of gastrulation is/are the __________________________. Choose all possible answers. a. Blastopore b. Blastomere c. Blastocoel d. Primitive streak e. Epiblast f. Koller’s sicklearrow_forward
- The foramen ovale causes the fetal circulatory system to bypass the ________. a. liver b. lungs c. kidneys d. gonadsarrow_forwardMatch the structures found in the fetal circulation with what each fetal structure becomes after birth: _____ Foramen ovale a. Ligamentum venosum _____ Ductus arteriosus b. Fossa ovalis _____ Ductus venosus c. Ligamentum arteriosarrow_forwardWhich of these embryonic germ layers gives rise to muscle, bone, andblood vessels?a. ectoderm b. endoderm c. mesodermarrow_forward
- pigment in bottom layer? A. melatonin B. melanin C. mesoderm D. ectodermarrow_forwardthe barrier seperates the spermatocytes dividing by meiosis from exposing their unique antigens to the immune system. a. blood-brain barrier b. blood-testes barrier c. blood-vas deferens barrierarrow_forwardObservations of the developing chick embryo reveal that skeletal muscles develop from the transplanted somites even though motor neurons innervating those muscles arise from chick neural crest cells. Based on these observations, what is MOST likely true? A. Neural crest cells differentiate into somites. B. Neural crest cells fuse with developing somite cells. C. Neural crest cells develop from migrating somite cells. D. Neural crest cells send projections into developing somites.arrow_forward
- What condition occurs if a male lacks the receptor that enables androgens to activate genes in a cell’s nucleus? a. Klinefelter’s syndrome b. Congenital adrenal hyperplasia c. Testicular feminization d. Turner’s syndromearrow_forwardWhat part of an infant’s body is said to stay in an immature state until needed to produce more cells? a. uterus b. stem cells c. umbilical cord d. placentaarrow_forwardCombination birth control pills exploit the _______________-feedback effect _______________ has on _______________ to prevent follicle maturation. a. positive; GnRH; progesterone b. positive; estrogen; GnRH c. negative; progesterone; GnRH d. negative; estrogen; GnRHarrow_forward
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