What is the function of the group of amino acids on the RNA polymerase, called the rudder?
A) It provides the energy required for formation of phosphodiester bonds in the elongating RNA molecule.
B) It helps unwind and open the DNA molecule.
C) It moves template and non-template strands of DNA through channels inside the enzyme.
D) It helps sigma bind to the RNA polymerase molecule.
Answer: C
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Which conclusion can be drawn from Gause's experiments on interspecific competition between two species of
Paramecium that are cultured together and feed on the same resource?
a. Both populations of Paramecium expire due to a build-up of waste products. b. One population of Paramecium used the other as a food source. c. Paramecium populations survive well together because they have no limiting resources. d. When two populations of Paramecium use the same limiting resource, they can coexist long term. e. When two populations of Paramecium use the same limiting resource, they cannot coexist long term.
From what you currently know, in a spacecraft at a point of weightlessness, which effect is most likely?
A. All balance systems would work similar to being on Earth with normal gravity. B. There would be absolutely no sense of balance signals without gravity. C. Gravitational equilibrium would be altered since the otoliths would not be pulled down by gravity. D. Without gravity, there would be no vertigo. E. Rotational equilibrium would be lacking and you could not detect head movement.
If it is too cold, then the ___ keeps the tail of the phospholipids from getting too close.
a. Glycoproteins b. Transport proteins c. Surface (peripheral proteins) d. Cholesterol
An element has 8 protons, 9 neutrons, and 8 electrons. Its atomic number and atomic mass, respectively, are _________.
Fill in the blank(s) with the appropriate word(s).