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21. rRNAs __________.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
a. function in aninformational capacity.
b. are adapted torecognize and bind other molecules
c. provide structuralsupport
d. catalyze the chemicalreaction that covalently links amino acids
e. b, c and d
Why do DNA and RNA polymerases can only elongate nucleotides 5' to 3'? How does this limitation affect DNA replication and RNA transcription?
A 35-year old man with Down's syndrome dies of acute lymphoblastic leukemia. Gross examination of the patien,s brain at autopsy shows mild microcephaly and underdevelopment of the superior temporal gyri. Histologic examination would most likely sh..
Combinatorial regulation of gene expression suggests that DNA sequences bound by particular transcription factors might be mixed and matched in different combinations to provide different specificities for regulating downstream genes. Using three dif..
A three-factor cross in Salmonella typhimurium was performed using bacteriophage P22. The cross was between an arg-leu-his- recipient bacterium and bacteriophage P22, which was grown on an arg+leu+his+ strain. 1000 arg+ transductants were selected..
Hershey and Chase experimented with radioactively labeled phosphorus and sulfur to determine that DNA and not protein is the genetic material.
Explain why antibiotics are effective at killing bacterial cells but do not seem to have an impact on human cells (eukaryotic cells). Use at least two examples, such as tetracycline, erythromycin, gentamycin, or chloramphenicol.
The human prion gene is called the PRNP gene. Fatal familialinsomnia and GSS are inherited prion disease and have mutations inthis gene. Which amino acid differ in the prion protein made byindividuals that have these two diseases?
Fluorescence in situ hybridization (FISH) is a technique wherechromosomes on a slide can be denatured, allowing single-strandedDNA probes labelled with a fluorescent dye to anneal to genomicDNA.
Which variable has an impact on the frequency of sickle cell anemia?
q1. if mendel chose corn instead of pea plants to conduct his first experiments what is the maximum number of traits he
Describe the structure of the semicircular canals and explain how they provide a sense of angular acceleration.
What would happen to urine output of a rabbit if cells of tunica media of all glomerular afferent arterioles were totally inactivated?
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