Homework Answers
17. True
Water is a polar molecule and carries a small positive charge and thus acts as the universal solvent .
16. D) They develop from endoderm cells.
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In deuterostomes, all the following are true about the development of the nerve cells EXCEPT: a)they...
Match the reproductive system cell with its description or function. Notochord Formation of internal organs during...
Match the reproductive system cell with its description or function. Notochord Formation of internal organs during development Germ layer that forms the lining of the digestive and respiratory systems Rod-shaped mesodermal structure that forms following gastrulation and releases signaling molecules Infolding of the blastula to form the three germinal tissue layers Hollow ball of cells that results from cleavage Rapid series of cell divisions without cell growth following fertilization A ball of mesoderm that eventually produces muscle and bone tissue...
All of the following are true regarding B-cell development EXCEPT: A. B cells complete maturation in...
All of the following are true regarding B-cell development EXCEPT: A. B cells complete maturation in the spleen. B. B cells are mostly developed when they leave the bone marrow. C. B cells cannot present antigens to T cells. D. Self-reactive B cells may be eliminated though apoptosis. E. Self- reactive B cells may be rendered unreactive (anergic).
Fluorescence Mapping of Blastomere in Sea Urchins Fate mapping is a technique that allows determination of...
Fluorescence Mapping of Blastomere in Sea
Urchins
Fate mapping is a technique that allows determination of the
fate of cells from the three germ layers. In worms, the endoderm
gives rise to the cells that line the intestines. The ectoderm
gives rise to cells of the nervous system and body covering. The
mesoderm gives rise to the muscles and other organs between the
ectoderm and mesoderm. A researcher is tracing the fate of a
particular cell (blastomere) from its position...
If you are observing embryonic development and notice that in one embryo the stomach, intestines, and...
If you are observing embryonic development and notice that in one embryo the stomach, intestines, and lungs do not develop, this is likely the result of a defect in which of the following cell layers? O A. Endoderm OB. Ectoderm OC. Mesoderm OD. Hypoblast When comparing oogenesis and spermatogenesis, which of the following statements is true? Both spermatogenesis and oogenesis commence during embryonic development, stop, and then are restarted only upon puberty and O fertilization. OB. Fewer mature, haploid gametes...
All of the following are true about alcohol (ethanol beverage) except a. Toxic metabolite b. Enters...
All of the following are true about alcohol (ethanol beverage) except a. Toxic metabolite b. Enters membranes of nerve cells c. Can be measured by GCMS d. 12oz beer raises blood concentration by 2% e. Death concentration is 350 ml/deciliter
6. All of the following statements are true about pregnancy EXCEPT: a. prenatal multivitamin/mineral...
6. All of the following statements are true about pregnancy EXCEPT: a. prenatal multivitamin/mineral supplements are generally recommended for pregnant women. b. a woman's energy needs do not increase significantly until the second trimester. c. at the 10th week of pregnancy, the fetus weighs less than 1 ounce. d. the average full-term infant is born after 40 weeks of gestation. 7. Which of the following CORRECTLY identifies the recommendations for average increased energy intake during the second...
Question 78 Which of the following statements about the cytoskeleton is TRUE? All eukaryotic cells have...
Question 78 Which of the following statements about the cytoskeleton is TRUE? All eukaryotic cells have actin, microtubules, and intermediate filaments in their cytoplasm The cytoskeleton provides a rigid and unchangeable structure important for the shape of the cell. The three cytoskeletal filaments perform distinct tasks in the cell and act completely independently of one another Actin filaments and microtubules have an inherent polarity, with a plus end that grows more quickly than the minus end С. D Question 79...
All of the following are true regarding NK cells EXCEPT Select one: a. they are found...
All of the following are true regarding NK cells EXCEPT Select one: a. they are found in tissues of the lymphatic system. b. they have the ability to kill infected body cells and some tumor cells. c. they are a type of lymphocyte. d. they release toxic substances that cause cell lysis or apoptosis. e. they destroy infected body cells by phagocytosis. Question 67 Not yet answered Marked out of 1.00 Flag question Question text Which of the following antibodies...
All of the following are true of lead as an environmental hazard except? A)Exposure to lead...
All of the following are true of lead as an environmental hazard except? A)Exposure to lead may come from food, water and air. B)Paint in toys is an important potential source of lead exposure. C)Paint in homes is no longer a source of lead exposure since lead in no longer allowed in paint. D)The higher the blood lead levels the more severe the biological effects due to lead poisoning.
12. All of the following statements concerning voltaic cells are true EXCEPT a) a salt bridge...
12. All of the following statements concerning voltaic cells are true EXCEPT a) a salt bridge allows cations and anions to move between the half-cells. b) electrons flow from the anode to the cathode in the external circuit. c) oxidation occurs at the cathode. d) a voltaic cell can be used as a source of energy, e) a voltaic cell consists of two-half cells. Answer:
Fluorescence Mapping of Blastomere in Sea
Urchins
Fate mapping is a technique that allows determination of the
fate of cells from the three germ layers. In worms, the endoderm
gives rise to the cells that line the intestines. The ectoderm
gives rise to cells of the nervous system and body covering. The
mesoderm gives rise to the muscles and other organs between the
ectoderm and mesoderm. A researcher is tracing the fate of a
particular cell (blastomere) from its position...
If you are observing embryonic development and notice that in one embryo the stomach, intestines, and lungs do not develop, this is likely the result of a defect in which of the following cell layers? O A. Endoderm OB. Ectoderm OC. Mesoderm OD. Hypoblast When comparing oogenesis and spermatogenesis, which of the following statements is true? Both spermatogenesis and oogenesis commence during embryonic development, stop, and then are restarted only upon puberty and O fertilization. OB. Fewer mature, haploid gametes...
Question 78 Which of the following statements about the cytoskeleton is TRUE? All eukaryotic cells have actin, microtubules, and intermediate filaments in their cytoplasm The cytoskeleton provides a rigid and unchangeable structure important for the shape of the cell. The three cytoskeletal filaments perform distinct tasks in the cell and act completely independently of one another Actin filaments and microtubules have an inherent polarity, with a plus end that grows more quickly than the minus end С. D Question 79...
12. All of the following statements concerning voltaic cells are true EXCEPT a) a salt bridge allows cations and anions to move between the half-cells. b) electrons flow from the anode to the cathode in the external circuit. c) oxidation occurs at the cathode. d) a voltaic cell can be used as a source of energy, e) a voltaic cell consists of two-half cells. Answer:
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