All of the following are model organisms, except
A) Saccharomyces cerevisiae.
B) Drosophila melanogaster.
C) Caenorhabditis elegans.
D) Arabidopsis thialana.
E) Homo sapiens.
E) Homo sapiens.
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You had a cold last month and you caught another one this month from your brother. Why could this
happen?
a. Memory cells were not formed as a response to the first cold. b. The antibodies formed as a response to the first cold were degraded. c. The two cold viruses are different. d. Your macrophages are not working properly. e. Your antigen-presenting cells do not recognize the second cold virus.
Species that usually colonize empty habitats are more likely to show traits that are favored by _____
a. r-selection b. K-selection
Comparison of conserved sequences among related species usually leads to the identification of ________, which illustrate the nucleotides most often found at each position of DNA in the conserved region
Fill in the blank(s) with correct word
A mutation in the laci gene that makes the repressor unable to bind lactose will result in:
A: increased synthesis of b-galactocidase only when glucose is low. B: repression of b-galactocidase synthesis under all growth conditions. C: constitutive (constant) synthesis of some b-galactocidase. D: all of the above