Researchers tried to explain how vesicular transport occurs in cells by attempting to assemble the transport components. They set up microtubular tracks along which vesicles could be transported, and they added vesicles and ATP
(because they knew the transport process requires energy). Yet, when they put everything together, there was no movement or transport of vesicles. What were they missing?
A) an axon
B) contractile microfilaments
C) endoplasmic reticulum
D) motor proteins
Answer: D
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Acridine orange is a purine base analogue.
Answer the following statement true (T) or false (F)
Fertilization usually occurs in the
A) ovary. B) uterine tube. C) uterus. D) endometrium (uterine lining).
Which of the following is a neurotransmitter that triggers a contraction of a voluntary muscle?
A) synapse B) action potential C) sodium D) acetylcholine
Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds are most visually sensitive to the color red. Hummingbird flowers are pollinated by hummingbirds. Which of the following features of these flowers would indicate they have coevolved with hummingbirds? (Check all that apply)
A. flowers produce a high volume of nectar and sugar B. flowers are low to the ground C. long tubular flowers D. blooming time of the flowers coincides with the arrival of the hummingbirds E. flowers are colored violet and blue