Biology I Most Missed Questions

d. surface of hydrocarbons

A salamander relies on hydrogen bonding to stick to various surfaces. Therefore, a salamander would have the greatest difficulty clinging to a ________. a. surface of mostly carbon-nitrogen bonds b. surface of mostly carbon-oxygen bonds c. slightly damp surface d. surface of hydrocarbons

a. determine if hair length is heritable

Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these creatures, you notice that males with longer hair get more opportunities to mate and father more offspring. To test the hypothesis that having longer hair is adaptive in these males, you should ________. a. determine if hair length is heritable b. test whether males with shaved heads are still able to mate c. look for evidence of hair in ancestors of tamarins d. test whether other traits in these males are also adaptive

a. 180 grams of glucose

One mole (mol) of glucose (molecular mass = 180 daltons) is ________. a. 180 grams of glucose b. 180 mL of dissolved glucose c. 1 kilogram of glucose dissolved in 1 liter of solution 180 × 1023 molecules of glucose

c. approximately 16 daltons

Oxygen has an atomic number of 8 and, most commonly, a mass number of 16. Thus, what is the atomic mass of an oxygen atom? a. approximately 8 grams b. approximately 8 daltons c. approximately 16 daltons d. approximately 16 grams

c. not form hydrogen bonds with each other

Sulfur is in the same column of the periodic table as oxygen, but has electronegativity similar to carbon. Compared to water molecules, molecules of H2S will ________. a. have a higher capacity to absorb heat for the same change in temperature b. have greater cohesion to other molecules of H2S c. not form hydrogen bonds with each other d. have a greater tendency to form hydrogen bonds with each other

a. MgCl2

The atomic number of chlorine is 17. The atomic number of magnesium is 12. What is the formula for magnesium chloride? a. MgCl2 b. MgCl c. MgCl3 d. Mg2Cl

120

Two moles of the compound in the C2H3OOH would weigh how many grams? (Note: The atomic masses, in daltons, are approximately 12 for carbon, 1 for hydrogen, and 16 for oxygen.)

six

What is the maximum number of hydrogen atoms that can be covalently bonded in a molecule containing two carbon atoms?

c. covalent bonds between carbon atoms

Which bond or interaction would be difficult to disrupt when compounds are put into water? a. ionic and hydrogen bonds b. hydrogen bonds c. covalent bonds between carbon atoms d. ionic bonds

d. Ammonia is being formed and decomposed simultaneously.

Which of the following is true for the reaction? 3H2 + N2 ⇌ 2NH3 a. The reaction is nonreversible. b. Hydrogen and nitrogen are the reactants of the reverse reaction. c. Only the forward or reverse reactions can occur at one time. d. Ammonia is being formed and decomposed simultaneously.