The major site of disposal of old red blood cells is the
a. liver.
b. kidney.
c. spleen.
d. tonsils.
e. bone marrow.
C
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Platys and swordtails are related tropical freshwater fish. In studies, researchers have shown that female platys prefer males with swordtails, even though males of their own species do not have them. This was discovered by attaching artificial swordtails to platys males.What does this suggest about the origin of the swordtail feature?
A. Female preference for swords may have predated the origin of the feature itself. B. Evolution of swords later led to evolution of female preference for swords. C. The same gene that causes sword development also causes development of neural circuits for female preference. D. Adjacent genes on the same chromosome cause sword development and development of neural circuits for female preference. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about the evolutionary origins of a characteristic involved in sexual selection? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Given that humans shifted from hunter-gathers to an agriculturally based society within the last 10,000 years does NOT mean that ________
A) we cannot expect evolution by natural selection in human populations to have kept pace with our changing way of life B) humans still retain many, if not most, of the features that made us well adapted to living in the hunter-gatherer societies of the stone age C) we can use knowledge of the differences between our current lifestyle and the lifestyle of our pre-agricultural lifestyle to better understand both the peculiarities of humans and risks associated with our modern lifestyle D) humans are unique in that we have the capacity evolve by natural selection much more rapidly in response to changes in our environment than other organisms do
Cell communication is critical for the function of both unicellular and multicellular eukaryotes. Which of the following is likely true of cell signaling?
(A) Cell signaling uses the highest molecular weight molecules found in living cells. (B) Cell signaling has largely been replaced by other cell functions in higher mammals. (C) Similar cell signaling pathways in diverse eukaryotes are evidence of conserved evolutionary processes. (D) Cell signaling functions mainly during early developmental stages.
The pentose phosphate pathway provides a means to break down glucose and
a) five-carbon sugars. b) proteins. c) lipids. d) ATP.