From a human developmental standpoint, what is the significance of Hox genes?
What will be an ideal response?
Hox genes are highly conserved among all organisms with bilateral symmetry. The arrangement and expression pattern of Hox genes establish anterior/posterior development in mammals. Some limb malformations in humans are caused by mutations in Hox genes.
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Which is/are true regarding organic acids?
A. They are weak acids. B. They are often involved in metabolic reactions. C. They often exist in the ionized form at the near-neutral pH found in a cell. D. Pyruvate and pyruvic acid refer to different forms of the same substance. E. All of the choices are true.
In dry shrublands, ____
a. plants are adapted to episodes of fire b. primary production is abundant throughout the year c. there are constant cool temperatures throughout the year d. winters are mild and summers are wet e. precipitation occurs evenly year round
The belief that humans arose in sub-Saharan Africa and then moved out is which model of evolution?
a. classic b. retroactive c. multiregional d. migratory e. African emergence
A bacterial allele that provides resistance to the antibiotic streptomycin is
A) neither beneficial nor detrimental to the cell. B) beneficial to the cell in the presence of any antibiotic. C) beneficial to the cell in the presence of streptomycin. D) always detrimental to the cell. E) always beneficial to the bacterial cell.