Eukaryotic cell nuclei contain genes that are
a. primarily of eukaryotic origin.
b. primarily of archaebacterial origin.
c. partly archaebacterial and partly eubacterial in origin.
d. derived from neither archaebacterial nor eubacterial cells.
Ans: c. partly archaebacterial and partly eubacterial in origin.
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Select all of the following that are valid counterarguments to the idea that evolution is "just a theory."
_____ Scientists use the word theory to describe unifying ideas. _____ Evolution is just a collection of facts without a central theme and this is not a theory. _____ Scientific theories are supported by many types of evidence and no empirical data refutes them. _____ Evolution occurred in the past, but it is not occurring in the present, so it cannot be a theory.
The upstream activator sequences (UASs) of yeast are analogous to ______________ in higher eukaryotes
A. promoters B. TATA boxes C. operators D. enhancers
During the sliding process in microtubules, the stalks of the dynein attach to and detach from the ________ in a cyclic manner.
A) A tubule B) B tubule C) radial spoke D) interdoublet nexin connections E) central pair
An area had no previous community and had no existing soil at first, but then living things started occupying the area. This situation would be called ________
A) biological magnification B) primary succession C) climax community D) secondary replacement