Which statement about determination is false [A] Differentiation precedes determ

Question

Which statement about determination is false [A] Differentiation precedes determination. [B] Most cells are determined early in their life cycle. [C] A determined cell will keep its determination no matter where it is placed In an embryo. [D] One cannot tell whether a cell is determined by its appearance. [E] A totipotent cell loses its totipotency when it becomes determined. Which of the following are the last set of genes to turn on in the Drosophila embryo [A] Segment polarity genes [B] Homeotic genes [C] Maternal effect genes [D] Gap genes [E] Pair rule genes The mesoderm [A] is located on the outside of the embryo. [B] lies between the endoderm and the ectoderm. [C] is found in blastula-stage embryos [D] gives rise to the linings of the gut [E] is formed during cleavage Differentiation of stem cells accompanies the of the stem cell's potential. [A] initiation [B] induction [C] determination [D] restriction [E] all of the above Which statement about determination is true [A] Differentiation precedes determination. [B] All cells are determined after two cell divisions in most organisms. [C] A determined cell will keep its determination no matter where it is placed in an embryo. [D] A cell changes its appearance when it becomes determined. [E] A differentiated cell has the same pattern of transcription as a determined cell. Which one of the following statements about frog development is not true? [A] At the end of gastrulation, ectoderm forms the outermost layer, endoderm the innermost layer, and mesoderm lies in between. [B] The nervous system develops from ectoderm [C] The blastopore becomes the anus. [D] The brain and spinal cord develop from a tube. [E] The notochord develops from endoderm

Explanation / Answer

Ans-24 (d) one can not tell wheater a cell is determined by its appearance

Ans-25 (a) segment polarity gene is activated in last

Ans-26 (b) lies between the ectoderm and endoderm

Ans-27 (c) determination

Ans-28 (a) differentiation precedes determination

Ans-29 (a) at the end of gastrulation ectoderm form outer layer, endoderm internal layer and mesoderm lies in between.it is not true because there are only ectoderm and endoderm during gastrulation in frog.

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