The main regulator of calcium blood levels is the ____
a. parathyroid glands
b. thyroid glands
c. hypothalamus
d. anterior pituitary gland
e. posterior pituitary gland
ANSWER: a
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A scientist collects a spore from a new species of fungus and observes that this spore has a flagellum. What does the presence of a flagellum suggest about the lifestyle of this species?
A. It is aquatic. B. It is an endomycorrhizal fungus. C. It relies on insects for spore dispersal. D. It is unicellular. E. Its spores are produced asexually.
Viruses are not yet considered an organism because they don't have cell membranes, organelles, and do not carry out vital life functions, although they do have a form of DNA (or similar RNA). A researcher proposing to categorize viruses in the tree of life would need to
A. establish any virus as a control group for experimentation with established domains of organisms. B. apply his/her proposal to any newly discovered virus, since others aren't currently considered organisms. C. remember that the scientific method will prevent any changes to the current taxonomy and tree of life. D. propose that relationship to other organisms as a new hypothesis, and test viruses for shared life characteristics. E. show the importance of genetic information as a characteristic of life.
The axonemal "9 + 2" pattern of microtubules is nine ________ surrounding a(n) ________
A) outer doublets; central pair B) basal bodies; inner two C) central tubules; double pair D) B tubule structures; middle two E) triplet microtubules; basal bodies
These lipids have a hydrophobic part and a hydrophilic part
A) triglycerides B) carotenoids C) phospholipids D) steroids