Imaginal discs are:a
found in mammalian cells and control gene activation in mature somatic cells.
b. paired groups of undifferentiated cells that are precursors of adult structures in
Drosophila.
c. found in plant cells and assist in the development of the flower.
d. part of the salivary gland of Drosophila.
e. found in Drosophila ovary cells and represent inactivated X chromosomes.
B
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Aminoacyl-tRNA synthetases catalyze covalent addition of ________ to tRNAs.
Fill in the blank(s) with the appropriate word(s).
The life cycle of a zygomycete differs
markedly from that of animals because in this fungus a. a sexual stage is absent. b. mitosis occurs in the haploid growth stage. c. there is no fusion of nuclei. d. meiosis occurs to produce the haploid growth stage. e. a diploid stage is absent
In the process of glycolysis, glucose is cleaved into a pair of three-carbon ________ molecules.
A. acetyl CoA B. lactate C. oxaloacetate D. pyruvate E. alcohol
Vertebrate forelimbs evolved through which mechanism?
A. Morphological convergence B. Divergent evolution C. Analogous evolution D. Homologous evolution E. Structural adaptation