A base is defined as a(n) _____ acceptor
a. neutron
b. electron
c. proton
d. anion
e. cation
c
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Which of the following is a correct pairing of RecBCD subunit to its activity?
A. RecB ? 5'-3' helicase B. RecD ? nuclease C. RecD ? 3'-5' helicase D. RecB ? chi binding E. RecC ? has a "pin" structure that helps separate strands.
Teratogenic effects of alcohol only occur during the first 12 weeks of pregnancy
a. True b. False Indicate whether the statement is true or false
Plant growth and flowering are strongly controlled by root and stem signal chemicals. Which of the following cell connection transports these molecules between adjacent cells?
A. tight junction B. plasmodesmata C. cell wall D. gap junction E. anchoring junction
Body parts that are similar in different lineages because the lineages have a common ancestor are ____
a. homologous structures b. comparative structures c. analogous structures d. repetitive structures e. vestigial structures