BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 52, Problem 2A
In the Spemann experiment, when the dorsal lip is transplanted, the recipient embryo then has a second source of molecules that
a. specifies ventral fate.
b. inhibits the molecules that specify ventral fate.
c. specifies dorsal fate.
d. inhibits the molecules that specify dorsal fate.
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Why is it easier to manipulate embryonic stem cells to differentiate into various tissues than it is to manipulate a typical adult cell?
a.
As cells develop, signaling pathways can cause some genes to be turned off during development.
b.
Adult cells have different DNA content than do embryonic stem cells.
c.
Emybronic stem cells pose less of a threat for organ rejection as do an individual s own adult cells.
d.
It is no easier to manipulate emybronic stem cells to differentiate into various tissues than it is to manipulate a typical adult cell.
The expression of maternal-effect genes directly leads to
a. the establishment of body axes.
b. segmentation.
c. determination.
d. cell differentiation.
Signal transduction pathways are important mechanisms for cell-to-cell communication in multicellular organisms. How do the target cells typically respond when they receive signals from neighboring cells during very early stages of embryo development?
A. The target cells move to one of the poles to establish the anterior-posterior body axis.
B. The target cells undergo changes in gene expression, sending them down a specific developmental path.
C. The target cells stop dividing so the neighboring cells have time to get to the same stage of development.
D. The target cells activate a collection of miRNAs to accelerate transcription and cell division.
Chapter 52 Solutions
BIOLOGY
Ch. 52.1 - Describe the events involved in fertilization.Ch. 52.1 - Prob. 2LOCh. 52.2 - Prob. 1LOCh. 52.2 - Prob. 2LOCh. 52.2 - Prob. 3LOCh. 52.3 - Prob. 1LOCh. 52.3 - Compare gastrulation in different animals.Ch. 52.3 - Name the extraembryonic membranes in amniotes.Ch. 52.4 - Prob. 1LOCh. 52.4 - Prob. 2LO
Ch. 52.4 - Prob. 3LOCh. 52.5 - Prob. 1LOCh. 52.5 - Explain the function of the organizer.Ch. 52.5 - Distinguish between primary and secondary...Ch. 52.6 - Describe the major developmental events in the...Ch. 52.6 - Explain the role of the placenta.Ch. 52.6 - Prob. 3LOCh. 52 - Data analysis Two different genes have mutant...Ch. 52 - Prob. 1IQCh. 52 - Prob. 1UCh. 52 - Which of the following plays the greatest role in...Ch. 52 - Gastrulation is a critical event during...Ch. 52 - Gastrulation in a mammal would be most similar to...Ch. 52 - Prob. 5UCh. 52 - Of the following processes, which occurs last? a....Ch. 52 - Which of the following would qualify as a...Ch. 52 - Prob. 1ACh. 52 - In the Spemann experiment, when the dorsal lip is...Ch. 52 - Suppose that a burst of electromagnetic radiation...Ch. 52 - Prob. 4ACh. 52 - Drug or alcohol exposure during which of the...Ch. 52 - Axis formation in amniotic embryos could be...Ch. 52 - Prob. 1SCh. 52 - You look up from your studying to see your dog,...Ch. 52 - Why doesnt a woman menstruate while she is...Ch. 52 - Spemann and Mangold were able to demonstrate that...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- What is one of the ethical issues related to using embryonic stem cells? O A. Embryonic cells are donated. B. Embryonic cells need to be revived from dead tissue. O C. Embryonic cells are harvested from young embryos. O D. Embryonic cells are unfertilized and become fertilized through in vitro fertilization.arrow_forwardWhich of the following statements relating to axis formation in chickens is FALSE? a. Henson's node secretes proteins that antagonize BMPs. b. The side of the epiblast facing the negative, basic albumin will become the ventral side of the embryo. c. Cells of the posterior marginal zone secrete Nodal to initiate the primitive streak. d. Water and sodium ions are transported from the albumin through the blastodisc cells and into the subgerminal space.arrow_forwardHow does sexual differentiation of the brain differ between rodents and primates?A. In rodents it depends on the level of testosterone. In primates it depends on the level of estradiol.B. In rodents it depends on the level of estradiol. In primates it depends on oxytocin.C. In rodents, testosterone must be aromatized to estradiol before it affects developing neurons.D. In primates, testosterone must be aromatized to estradiol before it affects developing neurons.arrow_forward
- How does sexual differentiation of the brain differ between rodents and primates? a. In rodents it depends on the level of testosterone. In primates it depends on the level of estradiol. b. In rodents it depends on the level of estradiol. In primates it depends on the level of testosterone. c. In rodents, testosterone must be aromatized to estradiol before it affects developing neurons. d. In primates, testosterone must be aromatized to estradiol before it affects developing neurons.arrow_forwardThe experiment involving the movement of the zone of polarizing activity in the chick embryo demonstrated ... ? Group of answer choices a. control of formation of the dorsal/ventral axis in the chick b. control of front/back (anterior/posterior) axis formation at the two cell stage c. hormonal control of development continued after d. how cells move and adhere to one another to complete developmental changes e. formation of front/back (anterior/posterior) positional information in limb bud formationarrow_forwardWhich of the following statements about iPS cells is correct? A. They are derived from embryonic stem cells. B. Transcription factors play a key role in their production. C. When implanted into a mouse blastocyst, they are not able to produce viable offspring. D. They have never been used in a human clinical trial.arrow_forward
- Observations 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_forwardBased on the information scientists and doctors have been able to collect, compare embryonic stem cells to induced pluripotent stem cells (iPSCs), then choose which statement below correctly describes these two types of stem cells. a. They are equivalent. b. iPSCs have more potency than embryonic stem cells. c. Embryonic stem cells are far more potent than iPSCs d. Both embryonic stem cells and iPSCs are totipotent.arrow_forwardA. CRANIAL (CEPHALIC) NEURAL CREST B. TRUNK NEURAL CREST C. VAGAL AND SACRAL NEURAL CREST Trace their differentiation pathways from the time the precursor cells break away from the neural tube. Make sure that this three (3) derivatives utilize different migratory pathways.arrow_forward
- The expression of homeotic genes leads to a. the establishment of body axes. b. the formation of segments in the embryo. c. the determination of structures within segments. d. cell differentiation.arrow_forwardIn early mammalian development, compaction would likely be blocked by inhibiting expression of which of the following? a. Beta-catenin. b. E-cadherin. c. Bcl2. d. Cdx2.arrow_forwardWhich of the following correctly explains how gene expression can change in a differentiating cell in an animal embryo?A. DNA methylation triggered by apoptosis leads to suppression of some genes and expression of others.B. Presence of germ layers trigger hormonal release from endocrine glands, signaling to certain cells to express genes.C. Cell signals through plasmodesmata allow coordination of cellular activities and cell differentiation.D. Cues from the cytoplasm and from surrounding cells can induce changes in gene expression.arrow_forward
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY