Design an experiment that would allow you to determine if a particular nucleus in a Drosophila embryo is capable of directing development of an entire new fly
What will be an ideal response?
Experiments in support of such genomic equivalence include the following: the observation that chromosome number and structure do not consistently change in different cells of an organism, nuclear transplantation in amphibians, and the presence of genes but no gene products in some tissues (hemoglobin, for example). For the Drosophila experiment, one could do nuclear transplantation similar to the classic experiments in amphibians and recent experiments in mammals or transplant a cell from embryos of one genotype to the posterior end of the early embryos of another genotype. The transplanted cells would be reprogrammed into germ cells by the posterior P granules. The transplant can be detected in the next generation by the recognizable different phenotypes due to different genotypes of the donor and recipient.
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Which of the following describes homeostasis?
a. Maintaining constant internal conditions b. Capturing energy for metabolic functions c. Inhabiting the same specific environment d. Duplicating and distributing chromosomes
A scientific theory ____
a. is widely accepted and supported by several evidences b. is widely accepted but not necessarily supported by several evidences c. is sometimes accepted and supported by several evidences d. is sometimes accepted and not necessarily supported by several evidences e. is always a "truth"
In which one of the following would one expect to find motor units made up of only a few muscle cells?
A) arm muscles B) eye muscles C) chest muscles D) thigh muscles E) lower-leg muscles
Large, multinucleate cells that break down bone are called:a
osteoblasts. b. chondrocytes. c. bone stem cells. d. chondroblasts. e. osteoclasts.