According to the second law of themodynamics, energy cannot be created nor destroyed
__________________ Indicate whether the statement is true or false.
F, first
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How can a lipid be distinguished from a sugar?
a. a lipid is made up of only hydrocarbons. b. lipids are mostly nonpolar. c. lipids are mostly saturated. d. a lipid dissolves in water.
Which statement about selective gene transcription in eukaryotes is not true?
a. Transcription factors can bind at a site on DNA distant from the promoter. b. Transcription requires transcription factors. c. Genes are usually transcribed as groups called operons. d. Both positive and negative regulation occur. e. Many proteins bind at the promoter.
Two sea urchin proteins were named cyclin A and B because, during the embryonic cell cycle, they were periodically
a. activated and inactivated by phosphorylation and dephosphorylation. b. synthesized and degraded. c. bound and released by another protein. d. ubiquitylated and non-ubiquitylated.
The prospects for developing a vaccine for the common cold are not promising because
A. many different viruses can cause the common cold B. there would be virtually no candidates for such a vaccine C. of the antigenic shift phenomenon D. funds for this type of research are not available E. viruses cannot be cultivated in tissue culture medium