Small RNAs can regulate gene expression. One type, called micro RNA (miRNA), acts by binding directly to
A. tRNA to prevent transcription.
B. mRNA to prevent transcription.
C. tRNA to prevent translation.
D. mRNA to prevent translation.
Answer: D
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While rock climbing, you encounter the plant shown in the photo on the right growing out of a crevice.
(a) Is this the sporophyte or the gametophyte? (b) What special name is given to the leaf of this plant?
The feeding chambers inside the sponge are lined with specialized cells that generate a directed water current through the sponge and trap and ingest microscopic food particles. What are these cells called?
a. amoebocytes b. sclerocytes c. choanocytes d. pinacocytes
The DNA phage ??174 was found to have a ratio of bases of 25A:33T:24G:18C. This departs from the usual A/T = 1 and G/C = 1 ratios. How can you explain this?
What will be an ideal response?
Asclepius, the Greek physician,
A. believed in or advocated the supernatural causes of, and cures for, disease. B. followed, Imhotep's foot steps and taught medicine in the old University of Alexandria during the Ptolemaic reign in Egypt C. wrote De contagione et contagiosis morbis et curatione. In it he described numerous contagious diseases and the means by which contagion can be spread. D. propagated the hypothesis that poisonous vapor or mist made up of particles from decomposing material, caused disease E. believed in or advocated that diseases had natural causes, e.g., "The Four Humor Theory", and that they could be cured by rational methods.