Passive molecular diffusion occurs when ____
a. the energy of ATP is added
b. random collisions between molecules occurs
c. there are variations in molecular sizes
d. enzymes catalyze their movement
e. vesicles break off from the membrane
ANSWER: b
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Using the drawing of mRNA below, choose the letter that best fits the description. Translation is often regulated by sequences in this region. ____
What will be an ideal response?
Which of the following describes the difference between fungal endomycorrhizae and fungal endophytes?
A. Endomycorrhizae live inside fungi and provide them with nutrients and water, and endophytes live inside plants, often parasitizing them and slowly breaking down their structure. B. Endomycorrhizae form arbuscules that facilitate exchanges of water and food between the fungus and plant root cells, whereas endophytes invade plant cells and provide the plant with protective antibiotics and toxins. C. Endomycorrhizae are beneficial to its host plant but endophytes harm the host plant. D. Endomycorrhizae form arbuscules on plant roots that produce toxins killing parasitic nematodes, whereas endophytes assist in the transport of water through the plant. E. None of these are correct.
The parasympathetic nervous system allows an animal to do which of the following?
a. process motor information b. integrate sensory information c. rest and digest d. fight or flight
Aluminum is toxic to plants because it
A) destroys chlorophyll in the leaves, reducing the rate of photosynthesis. B) inhibits production of pollen, reducing the rate of reproduction. C) damages the roots, reducing nutrient uptake. D) inhibits mitosis within the meristem tissues, reducing growth of the stems.