Acquired antibiotic resistance between two different species is an example of vertical gene transfer
Indicate whether the statement is true or false
FALSE
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Most eukaryotic cells contain mitochondria, but a few single-celled eukaryotic organisms found in oxygen-free environments do not
Which of the following observations led biologists to reject the hypothesis that these mitochondria-free eukaryotes evolved BEFORE the endosymbiotic event that established mitochondria in other eukaryotes? A. All eukaryotes exhibit some sort of energy utilization. B. Some eukaryotes don't have mitochondria, they have chloroplasts instead. C. The nuclear genome of these mitochondria -free eukaryotes contains relics of mitochondrial genes. D. All eukaryotes have remnant chloroplast genes.
Clonal selection is the idea that:
A. sequence information from the antigen is copied into the DNA of a B cell. B. genomic rearrangement responds to the presence of antigen to produce the correct antibody. C. the ability of an antibody to bind antigen results in mitotic cell division. D. Two answer options are correct: genomic rearrangement responds to the presence of antigen to produce the correct antibody AND the ability of an antibody to bind antigen results in mitotic cell division.
If Marfan syndrome results in death, it is usually due to rupture of the ____________________. Fill in the blank(s) with the appropriate word(s)
For the study of a protein in detail, an effort is usually made to first:
A) conjugate the protein to a known molecule. B) determine its amino acid composition. C) determine its amino acid sequence. D) determine its molecular weight. E) purify the protein.