The myelin sheath is formed by _______________, which wrap around the axons of some neurons.
a. cell bodies
b. synapses
This answer is incorrect.
c. Schwann cells
d. dendrites
e. nodes of Ranvier
Answer: a. cell bodies
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What is the primary reason that fungi are important in the carbon cycle?
A. Fungi are able to reach incredibly large sizes, storing carbon while they are alive, and contributing carbon back to the atmosphere when they die and decompose. B. Fungi are able to reach incredibly large sizes. Their high ratio of surface area to volume allows them to decompose large amounts of dead/decaying material, thereby returning carbon to the atmosphere. C. Fungi are able to reach incredibly large sizes. They have a high ratio of surface area to volume and are able to fix more carbon through photosynthesis than other plants of comparable size. D. Fungi are able to reach incredibly large sizes. Their high ratio of surface area to volume allows them to store more carbon (in the form of sugar) obtained through mycorrhizal associations than their symbiotic hosts.
The descriptive term ectotherm, when applied to reptiles, refers to the fact that:
a. they are warm-blooded b. they derive their body heat from outside of their body by certain behaviors c. their central body core works best when its temperature is the same as the ambient temperature d. their optimum temperature for muscle contraction occurs only when the sun provides direct solar heat e. they maintain their temperature by adjusting the production of metabolic heat
Which of the following is found in an open
circulatory system but NOT a closed circulatory system?
a. cavities in body tissues b. capillaries c. a heart or hearts d. a single vascular circuit e. more than one of these is found in an open circulatory system but NOT in a closed circulatory system
Which of the following investigators was (were) responsible for the following discovery? In DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine
A) Alfred Hershey and Martha Chase B) Oswald Avery, Maclyn McCarty, and Colin MacLeod C) Erwin Chargaff D) Matthew Meselson and Franklin Stahl