Our bodies store energy primarily in the form of lipids (fats), but also in the form of
a. glucose.
b. sucrose.
c. starch.
d. glycogen.
e. linolenic acids.
D
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Which of the following statements about DNA and RNA are true, and which are false?
a. DNA is a double-stranded molecule, and RNA is single-stranded. b. The nitrogenous base thymine is present in DNA and RNA, while uracil is present only in RNA. c. A hydrogen atom is present on the 3 carbon the ribose of DNA nucleotides, whereas a hydroxyl group is present at the same position on RNA nucleotides. d. The DNA and RNA molecules in a cell are copied by replication before a cell divides. e. RNA is the primary long-term storage molecule for genetic information in eukaryotic cells. f. Hydrogen bonds and phosphodiester bonds maintain the structure of DNA molecules, whereas only phosphodiester bonds are important for the structure of RNA molecules.
A researcher has a petri dish containing several species of bacteria, but no viruses. She notices that the population of E. coli in her petri dish has no antibiotic resistance
Two weeks later, she reassesses the bacteria and finds that the E. coli have acquired antibiotic resistance. How could this have happened? A. E. coli acquired the genes conveying antibiotic by conjugation with other bacterial cells. B. E. coli acquired the genes conveying antibiotic by transformation. C. Spontaneous mutations conveying antibiotic-resistance arose in the E. coli population of the petri dish. D. All of these answer options are correct.
How might a researcher best determine the location of a protein in a cell?
a. studying the amino acid sequence of the protein b. fusing a fluorescent tag to the protein to visualize its cellular location under a microscope c. attaching an antibiotic tag to the protein and determining its location using DNA microarrays d. analyzing the untranslated regions of the gene encoding the protein e. understanding the protein’s function
In order for a cell to receive a signal, it must possess an appropriate ____
a. glycolipid b. glycoprotein c. receptor d. transfer protein e. hormone