The interior of an unstimulated neuron maintains a constant negative charge, called the ________
Fill in the blank(s) with correct word
resting potential
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Tightly curled hair is caused by a dominant autosomal gene in humans. If a heterozygous curly-haired person marries a person with straight hair, what phenotypes (and in what proportions) are expected in the offspring?
What will be an ideal response?
Which of the following demonstrates negative feedback by the endocrine system?
(A) During labor, the fetus exerts pressure on the uterine wall, inducing the production of oxytocin, which stimulates uterine wall contraction. The contractions cause the fetus to further push on the wall, increasing the production of oxytocin. (B) After a meal, blood glucose levels become elevated, stimulating beta cells of the pancreas to release insulin into the blood. Excess glucose is then converted to glycogen in the liver, reducing blood glucose levels. (C) At high elevation, atmospheric oxygen is more scarce. In response to signals that oxygen is low, the brain decreases an individual's rate of respiration to compensate for the difference. (D) A transcription factor binds to the regulatory region of a gene, blocking the binding of another transcription factor required for expression.
In an ecosystem, nutrients __________ and energy __________.
Fill in the blank(s) with the appropriate word(s).
While strolling through an arboretum, a very tall tree bearing relatively small pollen-producing cones and short, needle-like leaves catches your eye. What else is also likely true of this species?
A. Its leaf surfaces are protected from desiccation by a thick waxy cuticle. B. It is a monocot. C. Its water-conducting cells are protected from desiccation by tori. D. It produces resin. E. It is pollinated by moths.