The absorption of water by a dry seed is known as:
a. apical dominance.
b. determinate growth.
c. imbibition.
d. senescence.
e. bolting.
c
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The enzyme nitrogenase is most directly involved in the process called ____
a. nitrification b. ammonification c. nitrogen cycling d. nitrogen fixation e. nitrogen assimilation
What is the ultimate source of a new allele in a gene pool?
a. natural selection b. mutation c. gene flow d. genetic drift
The part of the plant that allows for the exchange of carbon dioxide and oxygen is the:
a. Root b. Stomata c. Xylem d. Phloem e. Cuticle
The occurrence of an RNA world early in the history of life can never be proven, but experiments with _____ have
shown that it is feasible. a. in vitro evolution b. Darwin’s evolution c. indirected evolution d. chemical evolution e. biological evolution