Nitrogen is reduced in four cycles
What will be an ideal response?
1. Fe protein tranfers 2e- to FeMo center
2. FeMo protein binds 2H+, which is reduced to H2 gas
3. N2 takes the place of H2 at the binding site
4. Successive pairs of H+ and electrons reduce N2->HN=NH->H2N-NH2->2NH3
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The functional relationship between glial cells and neurons is analogous to the functional relationship between what cell types in plants?
A. cork cambium cells and primary meristem B. tracheids and vessel elements. C. parenchyma and schlerenchyma D. companion cells and sieve tube elements E. epidermal cells and ground tissue cells
Which statement about SNPs in the human genome is true?
A) Most SNPs have an effect on phenotype. B) Any two human genome copies will have on average 3 million single nucleotide polymorphisms. C) SNPs refer only to deletions or insertions, not base substitutions. D) Most SNPs are located in the introns of genes, and thus effect phenotype.
Select the three layers of the human eye.
a. sclera b. choroid c. retina d. all of the above
The least common type of skin cancer mentioned in the text, but the one that must be taken most seriously, is ________
Fill in the blank(s) with correct word