Which of the following did Watson and Crick already know when they were trying to determine the structure of DNA? The number of _____
A) purines is always larger than the number of pyrimidines
B) pyrimidines is always larger than purines
C) cytosines is always the same as adenines
D) guanines is always the same as thymines
E) purines is always the same as pyrimidines
Answer: E
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a. ectoderm ? endoderm ? mesoderm b. ectoderm ? mesoderm ? endoderm c. endoderm ? ectoderm ? mesoderm d. endoderm ? mesoderm ? ectoderm e. mesoderm ? ectoderm ? endoderm
What is the main function of RNA?
a. Copying DNA b. Protein synthesis c. Connecting nucleotides d. Storing genetic material
Which of the following statements best describes the termination of transcription in prokaryotes?
A) RNA polymerase transcribes through the polyadenylation signal, causing proteins to associate with the transcript and cut it free from the polymerase. B) RNA polymerase transcribes through the terminator sequence, causing the polymerase to separate from the DNA and release the transcript. C) Once transcription has initiated, RNA polymerase transcribes until it reaches the end of the chromosome. D) RNA polymerase transcribes through a stop codon, causing the polymerase to stop advancing through the gene and release the mRNA.
Which of the following is NOT a product of cellular respiration?
Carbon dioxide Energy (ATP) Oxygen Water