Traits that are controlled by genes located on the X chromosome are said to be ________.
A. gametal
B. sex-linked
C. autosomal
D. pleiotropic
Answer: B
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Aquaporins are proteins that control the passage of water molecules across a cell membrane. The protein forms a pore, or opening, in the membrane. You isolate what you think are two different molecules of aquaporin
, and determine that one of the proteins has a larger pore diameter than the second. Which of the following do you conclude? A) These two forms of aquaporin will have identical sequences of amino acids. B) These two forms of aquaporin will have different sequences of amino acids. C) You will have to sequence the proteins to compare their primary structure, because it should have no effect on pore diameter. D) These two forms of aquaporin have identical primary structure but differ in their tertiary structure.
Which of these is a type of chemical bond that involves the sharing of electrons
a. hydrogen b. buffer c. surface tension d. ionic e. covalent
Thinking about the processes of photosynthesis and cellular respiration in plants, plants are net
A. glucose and O2 consumers. B. O2 and CO2 producers. C. O2 and CO2 consumers. D. glucose consumers and CO2 producers. E. O2 producers and CO2 consumers.
Evidence from Stanley Miller's experiments and evidence from carbonaceous chondrites collected from meteorites, taken together, most directly support the contention that
a. life can arise under conditions of extreme heat or cold. b. organic molecules can be synthesized by natural chemical processes. c. life did not arise on earth, but rather arrived from another planet by meteorite. d. living organisms are required to produce complex organic compounds. e. organic compounds require gravity for their formation.