In barley seed germination, the ____ releases gibberellin, which triggers the synthesis of ____ in the ____
a. seed coat; ?-amylase; embryo
b. endosperm; cellulase; embryo
c. embryo; ?-amylase; endosperm
d. embryo; cellulase; seed coat
e. endosperm; ?-amylase; embryo
c
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A scientist fused a mouse cell and a human cell, then treated the cell with specific antibodies
covalently linked to fluorescent dyes (antibodies to mouse proteins--green; antibodies to human proteins--red). Forty minutes later, the researcher looked at the fused cell and observed ____.
a. the cell was still half red and half green. b. the red and green fluorescent labels were uniformly distributed across the entire membrane c. the red and green labels were distributed in intermingled patches d. the red and green labels flashed intermittently e. the red and green labels were distributed in a swirling pattern
The stomata:
a. only open at night b. are open when guard cells are swollen with water c. close when the osmotic pressure of guard cells increases d. are covered by the cuticle to reduce water loss e. open and close in response to sunlight only
Motor signals are also referred to as
a. efferent. b. motor. c. reverberating. d. saltatory. e. afferent.
Why do living organisms have the potential for errors (mutations and/or variations) in their development?
a. so that organisms may contribute to evolution b. so that organisms may live unchanged c. so that organisms may die unchanged d. so that organisms may contribute to reproduction