Crossing-over occurs between
a. sister chromatids of the same chromosome.
b. chromatids of nonhomologous chromosomes.
c. nonsister chromatids of a homologous pair.
d. None of these are correct.
c. nonsister chromatids of a homologous pair.
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Cyanide binds and impairs one of the molecules involved in the synthesis of ATP. The target organelle for cyanide must be
A. peroxisomes. B. lysosomes. C. ribosomes. D. the endoplasmic reticulum. E. mitochondria.
In most people, the mucus lining the nose and lungs would be considered
____________________.
a. an adaptive response against pathogens b. a physical barrier to reduce infections c. an innate mechanism d. both a physical barrier to reduce infections and an innate mechanism
Bacteria that can grow in the presence or absence of oxygen (O2) are called __________.
a. facultative anaerobes b. microaerophiles c. obligate aerobes d. obligate anaerobes
Which of the following is associated with a reduced risk of cardiovascular disease?
A) high levels of HDL B) high levels of LDL C) high consumption of trans fats D) high consumption of dietary cholesterol