The signal recognition particle (SRP) functions in
A. recognizing an ER signal sequence and binding to an SRP receptor in the ER.
B. binding to a newly translated protein and escorting it to the cell membrane, the cytoplasm, or the Golgi.
C. binding to a signal rRNA molecule and allowing it to exit the nucleus and associate with ribosomal proteins.
D. determining the destination of a vesicle that buds from the Golgi.
E. marking an organelle for destruction by lysosomes.
A. recognizing an ER signal sequence and binding to an SRP receptor in the ER.
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While on the H.M.S. Beagle, Darwin observed that ____
a. organisms on the Galápagos Islands resembled species on the mainland b. armadillos and glyptodonts coexisted in some habitats but not others c. similar organisms colonized similar habitats in South America and Europe d. organisms in different South American habitats resembled each other, but did not resemble organisms in similar European habitats e. no organisms resembled fossilized extinct animals
Answer the question using the accompanying figure. The function of the structure labeled "9" is ____
a. food intake b. digestion c. sexual reproduction d. water discharge e. asexual reproduction
Which statement about respiration is true?
A) Inhalation is a passive process. B) Exhalation is an active process during intense exercise. C) During exhalation, the pressure in the lung decreases. D) During inhalation, the diaphragm relaxes.
Molly, a 3-year-old active preschool girl, spent the morning playing with the other children at the day-care center. Shortly after lunch, she began to appear very flushed with bright red cheeks, and a check of her temperature revealed a low-grade fever of 99.5. She seemed to feel normal and showed no other signs of illness. Which of the following would be the most likely cause of her fever and bright red cheeks?
A) Human Parvovirus B19 B) Roseola virus (Human herpesvirus 6) C) Varicella-zoster virus D) Herpes simplex virus E) Cytomegalovirus