A collection of interacting organisms of different species is a(n)
A. ecosystem.
B. community.
C. population.
D. habitat.
B. community.
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A state of extreme sluggishness is known as ____
a. torpor b. endothermic c. migration d. extinction e. reproduction
The most common vector-borne bacterial disease in the United States is:
a. Lyme disease b. West Nile virus c. tuberculosis d. cholera e. MRSA
All of the following are ways in which blood functions to maintain homeostasis in the human body EXCEPT which one?
A) moving carbon dioxide away from cells following completion of aerobic metabolism B) conducting action potentials that originate in the nervous system to help with cell-cell communication C) transporting amino acids and other nutrients derived from digestion to all tissues in the body D) transporting hormones and other chemical messengers throughout the body from their point of secretion to their targets E) regulating the pH of body fluids
UV rays from the sun cause a specific type of improper base pairing called a thymine dimer. If a cell cannot correct this problem, the section of DNA can be removed, causing a deletion of several nucleotides. What will this cause?
A) A point mutation forms that leads to a change in one amino acid. B) A point mutation forms that leads to changes in a handful of amino acids. C) The codons shift by one letter, and all the codons before the mutation are changed. D) The codons could shift by one letter, and all the codons after that point would be off.