Which biome is characterized by an abundance of trees that lose all of their leaves at a specific time of
year?
a. taiga only
b. tropical rain forest only
c. temperate rain forest only
d. temperate deciduous forest only
e. both the temperate and tropical rain forests
E
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As the period of fetal growth comes to an end, a steep rise in ____ levels directly causes ____
a. progesterone; uterine cells to express oxytocin receptor genes b. progesterone; uterine contractions c. estrogen; uterine cells to express oxytocin receptor genes d. estrogen; uterine contractions e. estrogen; oxytocin production
Which physiological process allows many organisms to maintain relatively constant conditions within their cells and
tissues?
a. torpor b. homeostatic responses c. facultative responses d. behavioral adaptations e. photosynthesis
To identify genes coding for essential proteins, researchers can create temperature-sensitive mutations. These mutations allow proper protein folding and cell proliferation at the permissive temperature of 22ºC, but they cause protein misfolding and reduced cell proliferation at a higher restrictive temperature, such as 37ºC. Which of the following mutations might increase protein flexibility and lead to a temperature-sensitive phenotype?
A.) mutation of a lysine (that was involved in an ionic bond with a glutamic acid) to a glycine B.) mutation of a bulky isoleucine that was buried in the protein interior to a glycine (side chain=H) C.) mutation of a alanine to a cysteine, leading to the formation of a new disulfide bond
Many of the signs and symptoms of inflammation, including redness and itching, are due to the release of (histamines/leukotrienes/proteases) by degranulation of mast cells.
Fill in the blank(s) with the appropriate word(s).