Through an electron microscope, chromatin will have the appearance of beads on a string. What protein(s) will "tighten" the beads to create a pronounced zigzag appearance?
A. scaffolding proteins
B. NAP-1
C. H1 histone
D. Sp1
E. bromodomain proteins
C
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What is the limitation on size in most arthropods?
a. nutrient availability b. habitat population density c. exoskeleton d. depth of the water
The theory of catastrophism
a. was proposed by Lyell. b. indicates that a series of disasters necessitated separate acts of creation to replace species that became extinct. c. states that one worldwide disaster led to massive extinction and subsequent replacement by a new creation. d. held that after geologic events caused extinctions, the world was repopulated by the surviving species. e. has absolutely no basis in fact because extinctions just happen with no apparent patterns.
Match the skeletal muscle protein on the left with its function on the right
A) binds along the length of thin filaments to regulate myosin head association B) links thick filaments to Z line C) stabilizes thin filaments D) major component of thin filaments E) bundles parallel arrays of actin filaments at Z line F) major component of thick filaments G) M line myosin filament-binding protein H) mediates Ca2+ regulation of contraction I) major protein of sarcoplasmic reticulum J) attaches actin filaments to Z line 1) actin 2) myosin 3) tropomyosin 4) troponin 5) titin 6) nebulin 7) myomesin 8) ?-actinin 9) Ca2+-ATPase 10) CapZ
Each kingdom has a distinguishing characteristic. What is a characteristic of the kingdom Monera?
A) They reproduce sexually. B) Their cells are surrounded only by a cell membrane. C) Their cells do not contain any specialized structures. D) They produce their own nutrients.