Each of the following proteins is a component of both costameres and focal adhesions except
A) ?1-integrin.
B) vinculin.
C) talin.
D) ?-actinin.
E) dystrophin.
Answer: E
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With the sequence of the gene-coding regions of the human genome in hand and the development of newer sequencing methods, scientists ____
a. now know that the types of mutations present in all cancers are very similar b. can now sequence and analyze the protein-coding genes in cancer cells c. are still unable to systematically identify all the mutations present in a cancer cell d. found that the number of mutational events that occur during the transition from normal to malignant cells is much smaller than previously thought e. found that most tumors had at least 100 mutations in common with any other tumor, emphasizing the common origin of cancer
The base of a biomass pyramid is the smallest for ecosystems ____
a. in the desert b. in forest habitats c. in tundra habitats d. in the sea e. in prairie habitats
The type of movement that is specific and requires carrier molecules and energy is
A. active transport. B. exocytosis. C. facilitated diffusion. D. osmosis. E. endocytosis.
Which of the following is the strongest piece of evidence for why some scientists believe that we are at the start of a sixth mass extinction?
A) decrease in biodiversity B) decrease in fossil discoveries C) decrease in allopatric species D) decrease in hybrid fertility