Which of the following sites are likely to contain the greatest number of microbes?
A) Countertop in a microbiology lab
B) Computer Keyboard in a student computer lab
C) Book on the shelf of a microbiology lab
B) Computer Keyboard in a student computer lab
Feedback: Smooth surface that is often cleaned, not likely to have the greatest number of organisms
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Which of the following statements regarding altitude and climate are true?
I) Species composition on different sides of a mountain range are often different from each other. II) Rain shadows may appear on one side of a mountain range. III) The higher the altitude, the warmer the climate. IV) Both sides of a mountain range generally receive equal amounts of precipitation. A) only I and II B) only III and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, and III
For which of the following diseases are there
vaccines that provide protection against the disease?
a. measles b. mumps c. rubella d. chicken pox e. all of these
All animals need oxygen gas (O2 ) for their primary cellular-level functioning. Inside the cell, O2 is split apart into oxygen atoms. Eventually, electrons that are flowing through the cell will be "received" by this oxygen
But first, the electrons combine with protons present in the cell to form a basic element that has a single proton and a single electron. Then this element combines with the oxygen to form a certain chemical compound. In this scenario, what chemical compound is produced when this element combines with oxygen? A) Bicarbonate (HCO3 ) B) Water (H2O) C) Carbon dioxide (CO2 ) D) Ozone (O3)
For each of the following sentences, fill in the blank with the appropriate type of gating for the ion channel described. You can use the same type of gating mechanism more than once
A. The acetylcholine receptor in skeletal muscle cells is a(n) _________ ion channel. B. _________ ion channels are found in the hair cells of the mammalian cochlea. C. _________ ion channels in the mimosa plant propagate the leaf-closing response. D. _________ ion channels respond to changes in membrane potential. E. Many receptors for neurotransmitters are _________ ion channels.