While studying chromosomes with an electron microscope, you identify a structure that resembles a tangled web of beaded strings. What are the strings in this structure?
a. histones
b. nucleosomes
c. DNA molecules
d. transcription factors
c. DNA molecules
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Which of the following correctly lists the six most abundant elements found in living organisms?
A. carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur B. water, carbon, oxygen, nitrogen, phosphorus, sulfur C. water, carbon, hydrogen, oxygen, nitrogen, salt D. carbon, hydrogen, oxygen, carbon dioxide, nitrogen, salt
The receptors for many of the hormones involved in the menstrual cycle are found in the cytoplasm
A. true B. false
During noncyclic electron flow of the light reaction, which molecule is the final acceptor of the high-energy electron?
A. oxygen B. P700 C. NADP+ D. P680 E. ATP synthase
In a plasmid vector, the purpose of the lacZ gene is
a. to allow replication of the plasmid. b. to allow selection of transformed bacterial cells. c. to allow the plasmid to be cut once for cloning a fragment. d. to protect the plasmid from digestion by exonucleases. e. as an indicator that the plasmid is recombinant, containing a DNA insert.