How do "trait-group selection" models differ from "classic" models of natural selection?
a. Summing up the effect of a trait across groups yields different results in each type of model.
b. Trait-group models focus only on behavior, whereas classic models use alleles.
c. Trait-group models ignore individuals.
d. Trait-group models allow us to examine the processes within and between groups in a popula-tion.
D
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You have been assigned to analyze some extraterrestrial material recently collected from Mars. After examining a sample using a microscope you jump up excitedly and shout to your colleagues that you have confirmed the existence of life on Mars. One of your colleagues takes a look at your sample and remarks that all he sees is a single-celled "blob" with little internal structure. Assuming that life on Mars can be classified into similar domains and kingdoms as Earth, to which domain does your "blob" belong?
A. Archaea B. Fungi C. Protista D. Animalia Clarify Question 1. What is the key concept addressed by the question? 2. What type of thinking is required? 3. What key words does the question contain and what do they mean? Gather Content 1. What do you know about different domains?How does it relate to the question? Consider Possibilities 1. What other information is related to the question? Which information is most useful?If the only clue was single celled which could be correct? Choose Answer 1. Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process 1. 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?
An enzyme synthesized in the laboratory is found to have little activity when compared to the enzyme extracted from cell culture. Both enzymes were examined and have identical amino acid composition
What is the best explanation for the lack of activity of the synthesized enzyme? A) The van der Waals radius was altered during laboratory synthesis. B) The synthetic enzyme was not made of amino acids. C) The ATP required for self-assembly was present in the cell extract but not in the laboratory synthesis. D) Denaturation of the synthesized enzyme was not complete. E) The synthesized enzyme was not folded correctly because molecular chaperones were not present.
In a single sodium-potassium pump cycle, ATP is used with the result that
A. 3 sodium ions enter and 2 potassium ions leave. B. 2 sodium ion enters and 1 potassium ion leaves. C. sodium and potassium ions enter and water leaves. D. 2 sodium ion leaves and 1 potassium ion enters. E. 3 sodium ions leave and 2 potassium ions enter.
Equilibrium is sensed by ____.
A. chemoreceptors B. mechanoreceptors C. photoreceptors D. thermoreceptors E. nociceptors