In their experiments with the flowers of Begonia involucrate, Agren and Schemske (1991 ) observed that there was a trade-off between what two characteristics?
What will be an ideal response?
large individual flowers and more flowers per inflorescence
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If histones are extracted from DNA, what would remain?
A. DNA only B. DNA and tetranucleosomes C. DNA and chromosomal scaffolding proteins D. degraded segments of DNA
Once the threshold potential of a nerve impulse
is acheived
a. an action potential may occur or it may not. b. an action potential will occur. c. sodium ions close. d. the resting potential immediately follows. e. none of these will happen.
Which form of birth control is 100% effective?
A. natural family planning B. hormone patch C. birth control pills D. abstinence E. male condom
Based on fossil evidence, eukaryotes evolved about ________ years ago
A) 500,000 B) 1 billion C) 1.8 billion D) 3.5 billion