The endosymbiont theory is an explanation for some of the changes that occurred between the earliest cells on Earth and current cells on Earth. This theory, which is supported by a vast amount of scientific evidence, explains that mitochondria and chloroplasts had their origins as free-living organisms that were later incorporated into cells. How might further evidence change this theory?
A) If more evidence supports the endosymbiont theory, it will become a scientific hypothesis.
B) If more evidence supports the endosymbiont theory, it will become a scientific law.
C) Evidence that does not support the theory will be disregarded because theories cannot be revised.
D) Evidence that does not support the theory could cause the theory to be revised
Ans: D) Evidence that does not support the theory could cause the theory to be revised
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You can use Hardy-Weinberg to calculate allele frequencies, but not genotype frequencies. (Hardy-Weinberg can be used to convert genotype frequency into allele frequency, and vice versa.)
A. true B. false
Osteoporosis is a common condition that essentially results when homeostasis cannot be maintained in ________ and ________
A) osteoclasts; osteoblasts B) osteoblasts; osteons C) chondroblasts; osteoclasts D) canaculi; chondroblasts E) canaculi; osteoclasts
What is a photosystem?
A) Stacks of thylakoids B) A double-membrane organelle containing thylakoids C) Clusters of pigments and proteins that capture light energy D) A leaf or any green part of the plant
The active site of an enzyme is
A) the region of a substrate that is changed by an enzyme. B) the highly changeable portion of an enzyme that adapts to fit the substrates of various reactions. C) the region of an enzyme that attaches to a substrate. D) the region of a product that detaches from the enzyme.