Which of the following best demonstrates the unity among all organisms?
A) matching DNA nucleotide sequences
B) descent with modification
C) the structure and function of DNA
D) natural selection
E) emergent properties
Answer: C
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Biology
- Which of the following is not considered to be a weak molecular interaction?
- What bonding or interaction is most likely to occur among a broad array of molecules of various types (polar, nonpolar, hydrophilic, hydrophobic)?
- Van der Waals interactions result when
- Which of the following explains most specifically the attraction of water molecules to one another?
- Which bond or interaction would be difficult to disrupt when compounds are put into water?
- How many electron pairs are shared between carbon atoms in a molecule that has the formula C2H4?
- The atomic number of chlorine is 17. The atomic number of magnesium is 12. What is the formula for magnesium chloride?
- In ammonium chloride salt (NH4Cl) the anion is a single chloride ion, Cl. What is the cation of NH4Cl?
- What is the difference between covalent bonds and ionic bonds?
- In comparing covalent bonds and ionic bonds, which of the following would you expect?
- Which of the following molecules contains the most polar covalent bond?
- A covalent bond is likely to be polar when
- What results from an unequal sharing of electrons between atoms?
- When two atoms are equally electronegative, they will interact to form
- Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)?
- What is the maximum number of covalent bonds an element with atomic number 8 can make with hydrogen?
- A covalent chemical bond is one in which
- If a salamander relied on hydrogen bonds to cling to surfaces, what type of surface would cause the most problems for this animal?
- An atom with atomic number 12 would have what type of chemical behavior in bonding with other elements?
- Phosphorus-32, a radioactive isotope of phosphorus-31 (atomic number 15), undergoes a form of radioactive decay whereby a neutron turns into a proton and emits radiation in the form of an electron. What is the product of such radioactive decay of phosphorus-32?
- The organic molecules in living organisms have a measurably lower ratio of carbon-13/carbon-12, two stable isotopes of carbon that comprise approximately 1.1% and 98.9% of atmospheric carbon, respectively. What is a reasonable explanation for this phenomenon?
- What is the maximum number of electrons in a single 2 p orbital of an atom?
- Fluorine has an atomic number of 9 and a mass number of 19. How many electrons are needed to complete the valence shell of a fluorine atom?
- Two atoms appear to have the same mass number. These atoms
- The atomic number of each atom is given to the left of each of the elements below. Which of the atoms has the same valence as carbon (12/6 C)?
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