Which organisms lack nuclei?
a. protists
b. fungi
c. ctenophores
d. amoebae
e. bacteria
e. bacteria
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A biotech startup is developing a process that would allow clients the opportunity to clone their deceased dogs from a small tissue sample. The nuclei from deceased pets are confirmed to be intact and viable before and after they are excised and inserted into egg cells harvested from a donor dog. The egg cell’s own nucleus is carefully removed before the new nucleus is inserted and tested for damage that might cause the egg’s DNA to leak into the cell’s cytoplasm. After the nuclear transplant occurs, the egg cell is chemically stimulated to begin dividing as if it was a fertilized egg. The process works flawlessly, except for the fact that the clones inevitably develop symptoms of fatigue and respiratory problems. What is the most likely source of these symptoms?
a. The chemicals used to induce embryo development have damaged the implanted DNA. b. Implanting a nucleus in the egg causes structural weaknesses in the plasma membrane. c. Mitochondria from the egg donor contain a genetic defect that is inherited by the clones. d. Fatigue and respiratory problems are an autoimmune response to foreign DNA.
Genes located on the same chromosome are not always inherited together because of the process of ________, which occurs during meiosis; this process "reshuffles" the genes
Fill in the blank(s) with correct word
.____ were first discovered in experiments to define the nutrient media required for plant tissue culture
a. Gibberellins b. Cytokinins c. Salicylic acid d. Auxins e. Brassinosteroids
Of the following choices, the best outgroup to use to resolve a phylogeny for great apes would be
a. lemurs. b. butterflies. c. angiosperms. d. slime molds. e. Archaea.