Say Gus and Ida were released back into the wild in 2011, in an area that has a population of polar bears. You observe them for many years and they only breed with each other
Does this prove that they are members of a different species than the wild polar bears?
A. yes
B. no
C. maybe
B
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The increased acidity of seawater can harm marine life by making ____ available to organisms that require it
a. less nitrogen b. more sulfur dioxide c. less carbon dioxide d. more methane e. less calcium carbonate
In this section of the tissue layers of a cnidarian, which item, A, B, C, or D, is a nematocyst?
1.A
2.B
3.C
4.D
Which of the following is a correct interpretation of the wings of bats and the wings of birds?
a. They are analogous because they have a similar internal bone structure inherited from a common ancestor. b. They are homologous because they are adapted for the same function. c. They are homologous because they have a similar internal bone structure inherited from a common ancestor. d. They are analogous because the common ancestor of bats and birds had wings.
Which is the key difference between aerobic and anaerobic respiratory chains?
A) Aerobic respiratory chains accept electrons from both NADH and FADH2 while anaerobic chains only accept electrons from FADH2. B) Aerobic respiratory chains are organized so that electrons are passing from a higher to lower energy state while anaerobic chains are organized so that electrons are passing from a lower to a higher energy state. C) Aerobic respiratory chains are found in prokaryotic cells only while anaerobic chains are found in eukaryotic cells only. D) Aerobic respiratory chains always use oxygen as the final electron acceptor while anaerobic respiratory chains may use a variety of inorganic substances other than oxygen as the final electron acceptor. E) Aerobic respiratory chains that accept electrons depend on membrane-associated electron carrier molecules that carry out redox reactions while anaerobic chains use cytoplasm-associated molecules that carry out redox reactions.