The experiments that deciphered the genetic code used an enzyme called polynucleotide phosphorylase. If researchers added this enzyme to a large quantity of only guanine (G) ribonucleoside diphosphates then a RNA molecule would be produced that would
code for which amino acid?
A) lysine (lys)
B) glycine (gly)
C) arginine (arg)
D) phenylalanine (phe)
E) proline (pro)
Answer: B
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Human caused introductions can occur by which of the following? Check all that apply.
_____ plants and animals accidentally escaping from ships _____ automobile or truck tires _____ being in the soil or on a plant sold at a nursery _____ seeds or organisms attaching to clothing or shoes _____ international cargo ships releasing ballast water in the ocean before arriving at port
The ________ equation accounts for the movement of a single ion type, while the ________ equation takes into account the movement of multiple ions on membrane potential.
Fill in the blank(s) with the appropriate word(s).
Over geological time, organic matter from seedless vascular plants, buried beneath ____, formed the fossil fuels we
use today.
a. agricultural fields b. ocean and river sediments c. volcanic ash d. granitic and basaltic rock e. Earth’s mantle
The innermost layer of the root cortex, which is a selectively permeable barrier that helps control the
movement of water and dissolved minerals, is called the
a. endodermis. b. root cap. c. quiescent center. d. pericycle. e. root hairs.