Which statement about this diagram is true?
a. The chromosomes of a human egg cell are shown.
b. The colors correspond to chromatin density.
c. The chromosomes arranged by size and order are the karyotype.
d. The chromosomes of a prokaryote cell are shown.
c. The chromosomes arranged by size and order are the karyotype.
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Chemical synthesis of DNA:
A. requires attachment of a starting nucleotide to a glass or polystyrene bead through its 5' phosphate. B. proceeds in the 5' to 3' direction. C. requires transient protection of the nucleotide's functional groups by chemical modification.These protective modifications are reversible. D. requires that the chemical group used to protect the 3'OH of the pentose is removed at the beginning of each cycle. E. can be used to synthesize small chains of nucleotides up to 10 bases.
Urinary tract infections
A. are relatively rare. B. are the most common nosocomial infections. C. include puerperal fever. D. are not considered STIs. E. are the most common nosocomial infections AND are not considered STIs.
Which of these structures produces a hormone that activates secretion of enzymes within it?
a. mouth b. liver c. large intestine d. small intestine e. stomach
The frequency of heterozygotes for cystic fibrosis shows ethnic variations. Indicate whether the statement is true or false