Which of the following is a type of gland that
lacks ducts?
a. endocrine
b. muscular
c. nervous
d. exocrine
e. connective
A
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Transport of photosynthetically produced sugars from leaves to roots occurs by _____
a. pressure flow b. differences in source and sink solute concentrations c. the pumping force of xylem vessels d. transpiration, tension, and cohesion of water e. pressure flow and differences in source and sink solute concentrations
After using jelly on a sandwich, you close the jar and place it on a room temperature shelf instead of in the refrigerator. When you open the jar several weeks later, you notice microbial growth on the surface. What type of organism is likely to grow in this environment?
A. Bacteria B. Virus C. Fungus D. Protozoa
Which neurotransmitter appears to be associated with an energizing "good" feeling and is essential in hunger, thirst, and sex drive?
A) dopamine B) serotonin C) norepinephrine D) synapse
Park officials needed to repair the old mill dam in a state park and so had to drain the pond behind it, killing all the animals and many of the plants in the water. After the pond reformed and many years passed, a certain species of fish established
itself in the pond and remained there for more than 400 years. Which most directly describes the role of that type of fish? A) climax species B) invaders C) pioneer D) producers