During protein synthesis, ________ occurs in the nucleus as a copy of DNA is made into mRNA, and ________ begins in the cytoplasm, when mRNA associates with a ribosome.
What will be an ideal response?
transcription; translation
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Celiac disease is an autoimmune disorder which destroys the microvilli of the small intestine. Vitamin B12 can be absorbed by passive diffusion across the microvilli of the small intestine. Consider a patient who has had 10% of their microvilli destroyed. If the concentration of vitamin B is 0.6 pg/ml inside the lumen of the small intestine and 0.3 pg/ml on the inside of an epithelial cell, how
is the diffusion rate of vitamin B altered in this patient? A. It is reduced by 10%. B. It is reduced by .003%. C. It is increased by 10%. D. It is reduced by .3%. E. It is increased by .3%.
A 36-year-old man enters the emergency department with lesions that are painful, red, swollen, and indurated. He is febrile and exhibiting regional lymphadenopathy (swollen glands). The le-sions are marked and well demarcated with a raised border. Which organism is most likely re-sponsible for causing this infection?
a. Streptococcus pyogenes b. P. aeruginosa c. Microsporum spp. d. Bacteroides fragilis group
What is the outcome of F+ X F- conjugation?
a. The F- cell receives a copy of the F factor and becomes an F+ cell. b. The F- cell receives a copy of the F factor but remains an F- cell. c. Chromosomal DNA is transferred from the F+ cell to the F- cell. d. Chromosomal DNA is transferred from the F- cell to the F+ cell. e. A genetic recombination of bacterial genes takes place.
Gymnosperms were the dominant form of plant life on land:
A) before ferns evolved. B) about 20 million years ago. C) around the time the dinosaurs came to dominance. D) until the discovery of fire by humans.