Choose the correct order of steps for the synthesis of vitamin d.

a. inactive vitamin d is transported to the liver where it is modified.
b. inactive, chemically altered vitamin d is transported to the kidneys.
c. uv light strikes the skin and converts a steroid molecule into an inactive form of vitamin d.
d. vitamin d is activated under the influence of pth.

a. d, a, c, b
b. a, c,b, d
c. a, b, c, d
d. c, a, b, d
e. c, b, a, d

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

The instructions for making proteins come originally from

Which statement about dna replication is true? a. eukaryotes only have one circular chromosome that unwinds at multiple locations. b. eukaryotes can only replicate one segment of a chromosome at a time. c. prokaryotes can only replicate their single circular chromosome in the nucleus. d. prokaryotes only have one origin of replication to initiate replication.