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Explain the difference between positive and negative control over transcription. Why is it advantageous for the lac operon in E. coli to be under both positive and negative control? What would happen if only negative control occurred? What would happen if only positive control occurred?
What is the difference between conservation of amino acids vs. the identity of amino acids residues in a multiple sequence alignment?
Draw a polypeptide chain consisting of 10 amino acids. What is the 5th amino acid in your polypeptide. How do you know? Label the N-terminus and C-terminus.
Hemophilia is a sex-linked trait. A normal woman whose father has a hemophilia marries a normal man. What is the chance for their children to have the trait? Give the full explanation - genotypes of all involved.
About 5 percent of individuals with Down syndrome have a chromosomal translocation in which a third copy of chromosome 21 is attached to chromosome 14. If this translocation occurred in a parent's gonad, how can it lead to Down syndrome in a child.
Researchers want to identify the impact of cholesterol on the development of heart disease. They follow individuals who are vegan, and meat-eaters for ten years and they record if any of them experience a heart attack.
Determining genotypes in autosomal dominant pedigrees. From the list on the left hand of the picture are the choices for the blanks with arrrows.
Many processes are involved in creating the Resting membrane potential.” Describe the ion and concentration FORCES or PROCESSES that are involved in determining the resting membrane potential.
plants use the proton electrochemical gradient across the vacuole membrane to power the accumulation of salts and sugars in the organelle. this creates a hypertonic situation.
In cats, the X-linked allele O converts the black pigment found in the fur into an orange pigment. Heterozygous females are mosaics of orange and black pigmented fur.
Define the concept of biodiversity and explain the importance of biodiversity to plant communities. Describe particular threats to biodiversity that you see happening in your area of the country or community and discuss what might be done to count..
What series of nucleotide pairs in a Drosophila gene will encode the amino acid sequence met-trp-phe-trp-met (reading from the amino terminus to the carboxyl terminus).
Briefly explain four different evidences of evolution of modern day organisms from a common ancestor. Present these ideas with an approximate timeline of major evolutionary events.
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