Atmospheric O2 is actually a waste product of photosynthesis
Indicate whether the statement is true or false.
T
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John Bernal suggested that prebiotic synthesis of polymers took place on clay because
A. Clay minerals are known to bind organic molecules. B. Clay is negatively charged and attracts cations. C. Some minerals in clay attract organic monomers and catalyze chemical reactions. D. Clay minerals can attract and bind organic molecules, catalyze chemical reactions and attract cations. E. Clay is positively charged and can bind organic molecules for polymerization.
The Human Genome Project, which got underway in 1990, is an international effort to ________
A) collect samples of cells from all parts of the world in order to preserve human genetic diversity B) clone deleterious genes from humans and study their mode of action C) clone beneficial genes from humans for eventual use in gene therapy D) construct a physical map of the billions of base pairs in the human genome E) determine how many different human populations share in a common gene pool
The diversity in a mangrove marsh community is high if
A. the proportion of red mangroves, white mangroves, and black mangroves is equal. B. the proportion of red mangroves is far greater than white mangroves and black mangroves. C. there are a few species of mangroves, a few species of invertebrate animals, and a few species of vertebrate animals. D. All answers are correct.
Which of the following is composed of DNA?
A. centriole and chromosomes B. chromosomes and chromatin C. chromatin and nucleoli D. nucleoli and centrioles