The respiratory system is comprised of the respiratory tract and the accessory organs.
a. true
b. false
Ans: b. false
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A NASA probe returned samples of rocks from the surface of Mars. From these rocks, a prokaryotic organism was isolated and remained viable under conditions similar to that of Mars. The organisms are capable of dividing to replicate themselves. In order to determine whether the DNA replication of these organisms was semiconservative, an experiment using N15/N14 (similar to that of Mendelson and
Stahl) was performed. If the method of DNA replication were conservative, after one generation one would expect to see A) all of the DNA in the heavy (N15) band. B) all of the DNA in the light (N14) band. C) all of the DNA at a point midway between the heavy and light bands. D) half of the DNA in the light band, the other half in the heavy band. E) none of the above
What is the first step of the adaptive immune response?
a. Recruitment of helper T cells b. Inflammation c. Mast cells attacking the antigen d. Fever e. Recognizing a specific antigen
Expression of a(n) ________ alters gene transcription in E. coli by activating transcription of specialized heat stress response genes
Fill in the blank(s) with correct word
Which of the following statements about the speed of impulse conduction in a neuron is true?
a. Longer axons can transmit impulses faster than shorter ones. b. Unmyelinated axons transmit impulses faster than myelinated ones. c. Shorter axons can transmit impulses faster than longer ones. d. Nerve impulses travel faster than the speed of light. e. Unmyelinated axons with larger diameters transmit impulses faster than ones with small diameters