A flower with petals, sepals, and one carpel but no stamens is
a. perfect and incomplete.
b. imperfect and complete.
c. imperfect and incomplete.
d. perfect and complete.
e. sterile
C
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DNA is replicated during
a. the G1 stage. b. the S stage. c. the G2 stage. d. prophase. e. more than one of these
Some components and breakdown products of commonly used pesticides are intercalating agents, which cause mutations by _____
1.their incorporation into the DNA molecule due to structural resemblance to bases 2.chemically modifying the bases in DNA 3.inserting themselves into the double helix of DNA and causing errors during replication 4.generating free radicals that produce mutations if they interact with DNA
The antibiotic tetracycline binds to the 30S subunit of the ribosome as shown in Figure 20.1. The effect is to
a. Prevent attachment of tRNA. b. Prevent peptide bond formation. c. Prevent transcription. d. Stop the ribosome from moving along the mRNA. e. Prevent attachment of tRNA and mRNA.
Na+ reabsorption is a(n) __________ process, while Cl- reabsorption is a(n) __________ process in the proximal tubule.
A Active; active B Active; passive C Passive; passive D Passive; active