Which process establishes the three primary cell layers?
1.cleavage
2.blastulation
3.fertilization
4.gastrulation
4
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Which of the following is an important consequence of the evolution of diatoms and coccolithophorids?
A. They dominated photosynthesis in the oceans. B. The silica and calcium carbonate contained in these organisms became a primary source of carbonate sediments on the seafloor. C. They produced respective "blooms" in the ocean. D. They led to the extinction of cyanobacteria. E. None of these answer options is correct.
A SNP that can be either A or T is associated with a human disease. In the Case population, there were 2000 A alleles and 1500 T alleles. In the Control population, there were 2500 A alleles and 3000 T alleles. The allelic odds ratio indicates that the presence of an A confers a ________ times greater risk for the disease than does the T allele.
A) 1.33 B) 1 C) 0.64 D) 1.6
What is the role of the apical complex in apicomplexans?
A. The apical complex enables the apicomplexan to penetrate and bore into a host cell. B. The apical complex is a defensive structure that is used to destroy bacteria. C. The apical complex is a motility structure that enables cell movement. D. The apical complex is a feeding structure through which small food particles are taken in.
The text says that bovine somatotropin can be given to cows to boost milk production. Suppose that it would be possible to alter the genes of cows so that the animals always made excess somatotropin
What concerns do you think people might have about this procedure?