Nondisjunction refers to the ____
a. failure of sister chromatids to separate during mitosis
b. improper pairing of nonhomologous chromosomes during meiosis
c. failure of sister chromatids to pair during mitosis
d. failure of homologous pairs or sister chromatids to separate during meiosis
e. failure of homologous pairs to separate during mitosis
ANSWER: d
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Which of the following protist lineages is appropriately paired with its supportive and/or protective structure?
A) Diatoms have an intricate, chalky, chambered calcium carbonate shell. B) Parabasalids have an internal support rod, made of cross-linked microtubules, that runs the length of the cell. C) Alveolates have tough plates in the cell wall that are made up of cellulose. D) Euglenoids cover themselves with tiny pebbles. E) Dinoflagellates are surrounded by a glass-like, silicone dioxide cell wall.
Lipopolysaccharide is comprised of three moieties (lipid A, core oligosaccharide, and O-antigen), which require ________ biosynthetic pathway(s).
A. six B. one C. two D. three
Answer the following statements true (T) or false (F)
1. Phagocytes can only ingest objects that they are able to attach to. 2. The terms “leukemia” and “leukopenia” both refer to an abnormally low number of circulating leukocytes. 3. Ehrlichia spp. are intraleukocytic pathogens. 4. Chemokines are chemotactic agents that are produced by various cells of the human body. 5. Perspiring, swallowing, and urinating are all considered to be part of the first line of defense.
Which structure prevents food from traveling down the trachea?
A) Pharynx B) Bronchus C) Glottis D) Epiglottis