What percent of all species that have existed
have gone extinct?
a. 10
b. 25
c. 55
d. 75
e. 99
E
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For each function described below, choose the cytoskeletal element it best characterizes (some of the functions listed are carried out by more than one cytoskeletal element): a. microtubules b. microfilaments c. intermediate filaments
________ provide structural support for epithelial cell shape (keratins) ________ enable movement of cells ________ enable movement of substances within cells ________ provide structural support for fibroblast cell shape (vimentins) ________ arrange and tether organelles within the cytoplasm ________ provide cellular movement as a component of cilia flagella ________ provide structural support for nuclear envelopes (lamins) ________ attach to the cytoplasmic surfaces of desmosomes ________ provide structural support to cells and layers of cells through attachment to adherens junctions ________ help cells to withstand compression when organized a spokelike array by the centrosome ________ separate chromosomes during cell division when organized in a spindle apparatus _______ provide a contractile ring to separate cells during cell division ________ support the plasma membrane and organize membrane proteins ________ shorten cell shapes during contraction What will be an ideal response?
Ancestors of whales are believed to have been artiodactyls, a group of terrestrial mammals including all of the following animals except ________
a. deer b. antelope c. pigs d. horses
Sequences that contain information about the stability of a transcript are found in the
A) 5' UTR. B) coding sequence. C) 3' UTR. D) leading strand. E) lagging strand.
Selection can generate novel phenotypes by:
a. drift causing the creation of a new phenotype. b. increasing the probability of novel allele combinations. c. linkage disequilibrium and selective sweeps. d. B and C. e. None of the above.