Which of the following matches the organisms described with the correct domain?
a. bacteria--unicellular, eukaryotic organisms that always lack cell walls
b. archaea--multicellular, eukaryotic organisms that do not have cell walls
c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan
d. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources
Answer: d. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources
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Answer the following statements true (T) or false (F)
1. If lithium has an atomic number of 3 then it will have 1 valence electron. 2. The electronegativity of an atom is a measure of its ability to attract electrons to its outer shell from another atom. 3. Table salt forms from sodium and chloride via hydrogen bonding. 4. Molecules are generally rigid structures and rarely change shape.
Which ion is pumped out of guard cells in order to increase their turgidity?
a. H+ b. Ca2+ c. Na+ d. K+
Cl has 7 electrons in its outer shell and K has 1 electron in its outer shell. How is the bond in Cl2 different from the bond in KCl?
A. Cl2 is ionic and KCl is covalent. B. Cl2 is covalent and KCl is ionic. C. Cl2 and KCl are both ionic.
Which of the following is a condition caused by a sex-linked inheritance in which a male child will bleed extensively because he lacks the physiological properties to form a blood clot?
A) male-pattern baldness B) hemophilia C) sickle-cell disease D) color blindness