The developmental pattern of C. elegans is said to be mosaic because (a) development is controlled by gradients of morphogens (b) part of the embryo fails to develop if a founder cell is destroyed (c) some individuals are selffertilizing hermaphrodites (d) all development is controlled by maternal effect genes (e) apoptosis never occurs
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The developmental pattern of C. elegans is said to be mosaic because (a) development is controlled by gradients of morphogens (b) part of the embryo fails to develop if a founder cell is destroyed (c) some individuals are selffertilizing hermaphrodites (d) all development is controlled by maternal effect genes (e) apoptosis never occurs
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- the ectoderm of a gastrula stage vertebrate embryo, what is the major function of BMP4? a). repress nervous system development b). repress skin development c). promote nervous system development d). promote the onset of gastrulation e). More than one of the above are correct. 2. Which is an essential characteristic of neural stem cells? a) The ability to differentiate into any type of cell b) The ability to dispense with bacteria, damaged neuron, or toxic proteins in the brain c) The ability to guide neurons to their final location d) The ability to suppress the activity of the immune system e) The ability to differentiate into any cell type found in the central nervous systemIn the cnidaria the ectoderm cells are important because they can react to a stimulus (light) from the environment by exhibiting a response from their muscle cell as a directed movement. To do this ectoderm cells .... A) Are the first specialized digestive cells B) Are neurocytes that have membrane receptors which react to light C) Are prokaryotic cells D) Form the first digestive organ E) Are the only cells with the Na+/k+ pumps explain why 0In identifying the marginal cells of the tunicate embryo, which of the following is the role of the Macho- 1 gene? Choose all possible answers. a) suppresses notochord induction in mesenchymal cell progenitors b) a determinant that not only activates muscles but also distinguishes cell responses to the FGF signal c) can alter the responses to endodermal FGFs d) none of the above
- Which of the following is true about cleavage in C. elegans. Choose all possible answers. a) Exhibit a rotational holoblastic cleavage b) During the second division, the dorsal-ventral axis is determined. c) Cells are enveloped to an egg membrane called a chorion. d) Each of symmetric division process one differentiated descendant. e) At the transition between the 2 and 4-cell stages, the right-left axis can be seen.The Embryonic stem cells can be derived from _______ which is developed by “invitro fertilization”.a) late embryo b) early embryo c) embryo d) zygoteWhich of the following is an INCORRECT statement? Question 6 options: a) The early embryo of a higher animal is never like a lower animal, but only like its early embryo. b) During the first three stages of development, blastomeres become smaller by way of each embryonic cleavage. c) The space inside of the neural tube will eventually become the space inside of the digestive system. d) A zygote results from the union of sperm and egg.
- The fast block to polyspermy in sea urchins (a) is a depolarization of the egg plasma membrane (b) requires exocytosis of the cortical granules (c) includes the elevation of the fertilization envelope (d) involves the hardening of the jelly coat (e) is a complete blockIn vertebrate animals, spermatogenesis and oogenesis differ, in that 1.) Cytokinesis is unequal in oogenesis whereas it i equal in spermatogenesis 2.) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born 3.) Oogenesis produces four haploid cells, whereas spermatogenesis produces only one functional spermatozoon 4.) Oogensis ends at menopause. Whereas spermatogenesis is finished before birth 5.) Oogensis begins at the onset of sexual maturity whereas spermatogenesis happens in embryonic developmentAll of the cell types of an adult vertebrate develop from three primary embryonic germ cell layers, e.g. skin epithelium originates from ____ and intestinal epithelium from ____. A)ectoderm, endoderm B)ectoderm; ectoderm C)endoderm; endoderm D)endoderm; ectoderm
- In Deuterostomes, nutrient molecules (monomers) are taken in to the space between the endoderm and the ectoderm because... A) The ectoderm makes protein for movement B) The endoderm cells release hydrolytic enzymes that act on polymers C) The endoderm releases enzymes that conduct dehydration synthesis of proteins D) mRNA polymerase causes hydrolysis of DNA E) All are correct Explain whyFrom which of the following is the embryo developed? a) Trophoblasts b) Blastocoelen c) The yellow sacks d) Inner cell mass1. In Deuterostomes, nutrient molecules (monomers) are taken into the space between the endoderm and the ectoderm because a) the ectoderm makes protein for movement, b) the endoderm cells release hydrolytic enzymes that act on polymers, c) the endoderm releases enzymes that carry out dehydration synthesis of proteins. d) mRNA polymerase causes transcription. e) all are correct. 2.The Amoeba cell exhibits specialized abilities that enable it to react to a stimulus by producing a response or a behavior. It can do this because it has adapted properties exhibited by simpler more primitive cells. These cellular properties include a) Separation of the fluid environments inside and outside the cell. b) Active transport of Na+ out of and K+ into the cell, c) diffusion of Na+ in to and K+ out of a cell in reaction to a stimulus, d) the stimulus interacting with a receptor site in a membrane embedded protein, e) All of these are true.