True or False: purified phospholipids will gather together and form membranes only if the lipid bilayer? Select all correct choices
A. glycerol
B. fatty acids
C. phosphate
Answer Key: B
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Fats are composed of fatty acids and ________, which can both be metabolized for the production of ATP.
A) amino acids B) monosaccharides C) nucleic acids D) glycerol
In an experiment similar to that performed by Shatkin and colleagues, a student synthesized mRNAs such that 32P-GTP was incorporated; 7-meG labeled with 3H was used to cap the mRNA
A fraction of the sample was run on a gel and confirmedthat radiolabeled capped transcripts had indeed been produced. The remainder of mRNA was incubated with wheat germ cell extract to allow binding to ribosomes. The sample was deposited at the top of a sucrose density gradient and spun in a centrifuge. Surprisingly, neither label comigrated with the ribosome fraction; the ribosomes did migrate as expected. What is the most likely reason for this result? A. The ribosomes did not incorporate the 3H label. B. The sucrose gradient was not made correctly. C. The wheat germ was contaminated with guanylyltransferase. D. The wheat germ was contaminated with RNase E. The centrifuge did not spin at the correct speed.
What type of flower should you plant in your garden if you are particularly interested in attracting butterflies?
A. White day-blooming flowers with abundant pollen and a strong floral scent. B. Pendulous red flowers that are open day and night with no scent. C. Yellow flowers with abundant pollen and nectar and a strong floral scent. D. White, night-blooming flowers with a strong floral scent. E. Purple, tubular-shaped flowers with a light floral scent.
Which of the following techniques involves altering an organism’s DNA by inserting a gene
from a different organism?
a. DNA profiling b. genetic engineering c. therapeutic cloning d. DNA fingerprinting