Which structure always contains three nucleotides?
A) tRNA
B) an anticodon
C) mRNA
D) ribosome
B
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At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen, mediate so many
effects? A) Estrogen is produced in very large concentration by nearly every tissue of the body. B) Each cell responds in the same way when steroids bind to the cell surface. C) Estrogen is kept away from the surface of any cells not able to bind it at the surface. D) Estrogen binds to specific receptors inside many kinds of cells, each with different responses. E) Cells metabolize steroids in different ways, producing by-products that stimulate tRNA production.
Which of the following bacterial pathogens is found in water distribution systems?
A) Enterobacter aerogenes B) Klebsiella pneumoniae C) Legionella pneumophila D) Vibrio cholerae
RNAi could be used as an anti-viral treatment by ____
a. inactivating viral genes or key cell proteins involved in viral infection and spread
b. increasing immune system response to the virus c. binding to receptors on host cells used for viral entry d. promoting expression of viral DNA-degrading enzymes e. stimulating host cells to produce anti-viral compounds
Archaeoglobales have been isolated from marine hydrothermal vents.
Answer the following statement true (T) or false (F)