Morpholinos are
A) short DNA sequences found only in populations that trace their roots to Italy.
B) short synthetic molecules similar to DNA that are complementary to splice-site mutations.
C) types of DNA microarrays used to study gene expression.
D) a type of recombinant bacteria.
B) short synthetic molecules similar to DNA that are complementary to splice-site mutations.
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Hershey and Chase used 35S-labeled protein and 32P-labeled DNA of T2 bacteriophage to infect cells of Streptococcus pneumoniae bacteria.
Answer the following statement true (T) or false (F)
Marsupials, together with which one of the following groups, combine to make a monophyletic assemblage?
a. monotremes b. reptiles c. placental mammals d. birds e. amphibians
Retroviruses have a +ssRNA as their genome. In order to complete an infection, they must first make a ________ molecule, which they use to direct the synthesis of mRNA.
A. dsRNA B. DNA:RNA hybrid C. ?ssRNA D. dsDNA
How does the loop of Henle enable the mammalian kidney to produce hypertonic urine?IThe ascending limb of the loop actively extrudes Na+.IIThe descending limb interacts with the ascending limb to raise the osmolarity of the extracellular fluid in the renal medulla.IIIThe concentration is further enhanced by the presence of urea, which draws water out of the collecting ducts by osmosis.
A. Just III B. II and III C. Just I D. I, II, and III E. I and II