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The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups-Lophotrochozoa and Ecdysozoa. What does this finding suggest?
1) The protostomes are a polyphyletic group.2) Division of these two groups occurred after the protostome developmental sequence appeared.3) These two subgroups have a common ancestor that was a deuterostome.4) The lophotrochozoans are monophyletic.
Experiments with erythrocyte "ghosts" were carried out to learn more about the glucose transporter in red blood cells. "Ghosts" are prepared by lysing red blood cells in a hypotonic medium and washing away the cytoplasmic contents.
An open system in which the growth rate is maintained by adding a nutrient at the same rate as that medium containing micro-organisms is removed is called
As you know Griffiths, and Avery, MacLeod and McCarty 1st experimented with the concepts of lateral gene transfer in bacteria as it relates to transformation.
Is it possible that tubulin and microtubules contribute to the development of cancer? Could these important structures be targets for cancer therapy?
Assume you are studying genes and DNAsequences involved in the regulation of the grandoperon. When your lab's strain of e. coli are in the presence of the sugar "grandiose," transcription of 2-enzymes grandAand grandB increases.
A crude cell-free extract of a skeletal muscle contained 32 mg protein/ml. Ten ul (microlitres) of the extract catalyzed a reaction at rate of 0.14 umole/min under standard optimum assay conditions.
Many tumors secrete thier own growh factors. This form of stimulation is called;
Explain three things that a paleontologist must do to plan a fossil hunting expedition so that he is likely to find evidence to reply a specific scientific question.
Represent graphically the relation between melting temperature and the G-C content of DNA. Construct relations for dependence of melting temperature of a 30 bp DNA duplex on the G-C content.
During hemorrhagic shock in which blood pressure is decreased, which of the regulatory mechanisms is most important is increasing cardiac output to help maintain blood pressure?
Assume if the DNA in one of your skin cells were to change, which cells that are you would inherit that change?
Suppose that you discover a new life form on Mars. These organisms have DNA containing the same four nucleotides as Earth DNA. They also make proteins using a triplet code, so they use the same 64 codons that Earth organisms do.
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