Giardia and Trichomonas are unusual eukaryotes because they
A) are motile.
B) lack mitochondria.
C) lack nuclei.
D) do not produce cysts.
E) do produce cysts.
B
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In what way does hemoglobin act as a buffer against changes in blood pH?
A) Subsequent binding of oxygen is drastically reduced after the first one is bound. B) Hemoglobin binds some of the excess protons released by carbonic acid. C) Hemoglobin produces protons or hydroxide ions as needed to alter the blood pH. D) Hemoglobin removes excess protons from the red blood cells so that they can be excreted through the kidneys.
Protein filaments with a diameter of 4-7 nm that play a role in cell movement and shape change are called
A. mycelia. B. microtubules. C. microfilaments. D. intermediate filaments.
Pigs have feet with toes that do not touch the ground. These toes are examples of ____
a. vestigial structures b. evolving structures c. homologous traits d. deleterious mutations e. biological gradualism
A new maple tree was planted in your yard. Two of the branches are only four feet from the ground. Considering the growth pattern of plants, describe the relative height of the branches five years in the future
What will be an ideal response?