Which of the following elements is not considered an essential micronutrient for plants in general, but is required by horsetails and perhaps some grasses such as wheat?
a. gold
b. boron
c. silicon
d. zinc
e. magnesium
C
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Genetic studies have identified an allele (32) that seems to provide protection against AIDS. Which of the following would most likely explain the reason why our population has this mutation?
A. Our bodies are designed to protect us against a myriad of pathogens. Our immune system was preparing for future viruses. B. This mutation likely benefited the human population against some other early pathogen. C. This mutation was initially harmful, but it now affords us protection against AIDS. D. Mutations that become prominent in a population initially were neutral but then become advantageous later on.
Homologous genes in different species are called
A. analogs. B. paralogs. C. orthologs. D. dialogs. E. monologs.
In yeast, if you want to prevent the Gal4 regulatory protein from binding near each of the GAL genes, which sequence element would you target?
A) core promoter B) proximal elements C) enhancer sequence D) homeodomain motif E) upstream activator sequence
A fruit is a mature, ripened ________ containing fertilized seeds.
A. monocot B. cotyledon C. ovary D. ovule