Grass flowers lack petals and sepals. Which of the following statements is TRUE?
A) They are incomplete flowers lacking one or more floral parts.
B) They are pollinated by flies, which don't require showy, scented petals.
C) They are imperfect flowers lacking stamen or carpals.
D) These flowers are pollinated at night, so they don't benefit from showy petals or sepals.
A
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In eukaryotic cells, ____
a. gene expression is regulated mostly at the level of transcription b. all mRNAs tend to remain stable for about the same length of time c. mRNA activity is altered through modifications such as phosphorylation d. promoters are typically "on" in the absence of regulatory proteins e. genes involved in similar processes are clustered together in operons
Although carbon dioxide contains carbon, it is
not considered an "organic" compound because a. it is not found in the earth's crust. b. it is not present in living cells. c. the carbon atom is not bonded to at least one hydrogen atom. d. the carbons are not in chains or rings. e. it is too small.
Which of the following can release histamines?
a. Invading bacterial cells b. Cells from damaged tissues c. Wood from a splinter d. Cells from damaged tissues and the complement pathway e. The complement system
Which of the below is responsible for the single direction of action potential propagation?
A. The one-way valves in the axon B. The refractory period C. The Na+ leak channels in the axon D. The Ca+ / K+ pump