Describe the four stages of chemical and biological evolution.
What will be an ideal response?
Stage 1: Small organic molecules evolved from inorganic compounds.
Stage 2: Organic molecules joined to form larger macromolecules such as DNA, RNA, and proteins.
Stage 3: Organic polymers became enclosed in a membrane to form the first precursor cells, called protocells.
Stage 4: Protocells acquired the ability to self-replicate, as well as other cellular properties.
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Photosynthesis must provide a source of electrons and H+ ions because ______________
a. atmospheric CO2 must be oxidized by adding electrons b. CO2 must be reduced to produce sugars c. hydrogen atoms are added to oxygen to form water d. hydrogen ions and electrons react to produce hydrogen gas e. hydrogen ions and electrons are converted into oxygen gas
How many heme groups does each hemoglobin molecule contain?
a. one b. two c. four d. eight
What kind of bacteria is used to monitor coastal water quality?
a. Cyanobacteria b. Chemosynthetic bacteria c. All of these choices d. Coliform bacteria
Net or overall probabilities are obtained by multiplying separate independent probabilities. This is formally known as
A) the sum rule. B) the chi-square test. C) the product rule. D) the sign test. E) the probability rule.