Which type of fat was found to contribute the most relative risk of developing heart disease?
A) saturated fat
B) monounsaturated fat
C) polyunsaturated fat
D) trans fat
Answer: D
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During which stage of the sexual response cycle do the tissues of the sex organs begin to show increased blood flow and swelling?
A) orgasm B) excitement C) resolution D) plateau
Which of the following cells are a major reservoir for and distributor of HIV?
A) helper T cells B) B lymphocytes C) cytotoxic T cells D) infected dendritic cells E) monocytes and macrophages
The biological species concept is based on:
A) differences among populations. B) geographic isolation. C) DNA sequences. D) reproductive isolation.
Plasmids are distinguished from bacterial chromosomes in that
A. plasmids have few genes, while bacterial chromosomes have many genes. B. plasmids occur in the cytoplasm, while bacterial chromosomes occur in the nucleus. C. plasmids are circular, while bacterial chromosomes are linear. D. plasmids consist of single-stranded nucleic acids, while bacterial chromosomes consist of double-stranded nucleic acids. E. plasmids are composed of RNA, while bacterial chromosomes are composed of DNA.