Regarding the structure of DNA, the covalently arranged combination of a deoxyribose and a nitrogenous base would be called a(n) ________
A) nucleoside monophosphate
B) oligonucleotide
C) nucleotide
D) ribonucleotide
E) nucleoside
Answer: E
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Which of the following is true of "type 1 diabetes"?
a. Insulin levels are near normal. b. Target cells do not respond to insulin. c. It is the more common form of diabetes. d. It is thought to be an autoimmune disease. e. It usually occurs in middle-aged people.
The history of life on earth spans nearly
a. 100,000 years. b. 500,000 years. c. 100 million years d. 1 billion years. e. 4 billion years.
Which of the following immune system components has been identified in almost all organisms studied?
a. bone marrow b. phagocytes c. antimicrobial peptides d. T-cells e. memory cells
In vertebrates, DNA methylation - the addition of a methyl group to DNA nucleotides - ensures that
A. the gene functions without interruption. B. once that gene is transcribed, the mRNA is saved and used over and over again. C. no errors will be made during transcription. D. once a gene is turned off, it will remain off. E. the nucleosome will quickly form, which assists in mRNA formation.