Protein filaments with a diameter of about 10 nm that are major components of the cytoskeleton are called
A. mycelia.
B. microfilaments.
C. microtubules.
D. intermediate filaments.
Answer: D
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The normal human karyotype contains __________ chromosomes
a. 22 b. 23 c. 44 d. 46 e. 54
Ehlers–Danlos syndrome and scurvy both are characterized by defects in
A) fibronectin. B) desmosomes. C) collagen. D) dystrophin. E) elastin.
How do radioactive isotopes differ from isotopes?
A) Radioactive isotopes have more neutrons than do isotopes. B) Radioactive isotopes are stable; isotopes are unstable. C) Radioactive isotopes have fewer neutrons than do isotopes. D) Radioactive isotopes are unstable; isotopes are stable.
The number of the greater prairie chicken, a bird found in the prairies of Illinois, was drastically reduced during the 19th and 20th centuries due to hunting and habitat destruction. The number of the birds went from millions to fewer than 50. When the population rebounded to over 5,000, more than 30% of the alleles were lost forever. The allele loss in the above example is mostly due to__________________.
A. More information needed. B. Natural Selection C. Sexual Selection D. Genetic Drift