A warning sign of possible cancer would be any of the following EXCEPT:
A) persistent, unusual bleeding
B) a change in bowel habits
C) sudden development of fever, nausea, and diarrhea
D) a change in shape, color, or surface of a skin lesion
Ans: C) sudden development of fever, nausea, and diarrhea
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The atmosphere and seas of the early Earth lacked oxygen. What kind of organisms could NOT have lived under those conditions?
A. obligate aerobes B. obligate anaerobes C. cyanobacteria D. chemoautotrophs E. All of the other choices are correct.
How does the telomerase attach to the telomere area on the chromosome?
a. It is assisted by specialized helper enzymes. b. It has a built-in RNA template that binds to the end of the telomere. c. Telomerase cannot bind to the telomere. d. Primase builds an RNA primer to assist in binding telomerase to the telomere.
The following is a list of events that were involved in the formation of self-replicating living cells. Which one of the following best represents the order in which these events are believed to have occurred?
1. formation of RNA 2. enclosure of small organic molecules within a membrane 3. formation of simple organic molecules from atmospheric gases 4. formation of a lipid-protein membrane A) 3, 1, 4, 2 B) 3, 4, 2, 1 C) 4, 2, 3, 1 D) 4, 1, 3, 2 E) 1, 3, 4, 2
What kind of noncovalent interaction is typified by interactions between two molecules that are so close together that they can experience weak attractive forces bonding them together?
A) H bonds B) hydrophobic interactions C) ionic bonds D) polar covalent bonds E) van der Waals forces