____ are organisms that contain two or more kinds of genetically dissimilar cells from different zygotes
a. Heterozygotes
b. Chimeras
c. Recombinants
d. Transgenics
e. Polyploids
b
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A small, heat-stable DNA-binding protein present in the cells of some Archaea, called Sac7d, binds to the minor groove of DNA in a very specific manner and increases its melting temperature by 40 °C
Indicate whether the statement is true or false.
The proportion of the air we breathe accounted for by oxygen is approximately ___%.
A. 21 B. 1 C. 5 D. 50 E. 78
Experiments by Stanley Miller in the 1950s demonstrated that the first organic molecules on earth
A) were nucleic acids such as RNA and DNA. B) most likely formed in an extraterrestrial environment and were deposited on earth via asteroids. C) could have formed abiotically in a reducing atmosphere containing hydrogen, methane, ammonia, and water vapor. D) were catalysts composed of simple amino acids. E) were catalysts composed of simple amino acids and most likely formed in an extraterrestrial environment and were deposited on earth via asteroids.
Most molecular biologists think that viruses originated from fragments of cellular nucleic acid. Which of the following observations supports this theory?
a) Viruses can reproduce only inside host cells. b) Viruses can infect both prokaryotic and eukaryotic cells. c) Viral genomes are usually similar to the genome of the host cell. d) Viruses contain either DNA or RNA. e) Viruses are enclosed in protein capsids rather than plasma membranes.