The human genome encodes about 21,000 protein-coding genes. Approximately how many such genes does the typical differentiated human cell express at any one time?
(a) 21,000—all of them
(b) between 18,900 and 21,000—at least 90% of the genes
(c) between 5000 and 15,000
(d) less than 2100
(c)
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Genetic sequences may be useful in predicting protein structure because
A. there is a high statistical frequency of specific amino acids within a given secondary structure B. the folding of the protein is based on how the mRNA folds. C. the physical and energetic properties of the DNA influence protein folding. D. knowing what specific codons are used for each amino acid in the protein can help predict its structure.
An antigen-MHC complex is usually found on which cell type?
a. neutrophils b. helper T cells c. cytotoxic T cells d. plasma cells e. dendritic cells
Below are figures for the percentage allocation of production to shoots (above-ground parts) for four different species. Which of these is likely to be an annual herbaceous species?
A) 80-90% B) 70-80% C) 60-70% D) 20-60%
All of the following statements are reasons why fluorescent in situ hybridization (FISH) has become a valuable tool for environmental microbiologists EXCEPT
A) it allows for detection of uncultured microbes. B) it demonstrates the diversity of microbes in an environment. C) it allows observation of microbes in their natural environment in association with other microbes. D) it allows one to obtain pure cultures of microbes. E) All of the answers are correct.