Describe how and why some species of nudibranchs use the stinging nematocysts of cnidarians
What will be an ideal response?
The diet of some nudibranchs consists of anemones that live on the bottom. Rather than digesting the stinging nematocysts of these anemones, the nudibranchs retain these structures in the tips of their gills and use them for their own defense.
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Sickle cell disease is inherited as an autosomal recessive trait. The genotype of an individual with sickle cell disease is
A) homozygous dominant. B) homozygous recessive. C) heterozygous dominant. D) heterozygous recessive.
Atrazine
a. is an herbicide that has been in use for more than 40 years. b. application in the United States totals about 36 thousand metric tons annually. c. is used mostly to kill weeds in cornfields. d. contamination of soils and water is common in the American Midwest. e. fits all of these descriptions
Which of the following is true about myosin I?
a. It is involved in muscle contraction. b. It has a long ?-helical tail through which it forms homodimers. c. It does not act as a molecular motor. d. It links the actin bundles to the plasma membrane in the microvilli of intestinal cells.
A serum sample from a patient is examined on an electron microscope, and observed to contain Dane particles, filamentous, and spherical virion particles in abundance. This observation indicates infection with
A) human herpesvirus 1. B) EBV. C) hepatitis B. D) hepatitis D. E) VZV.