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

Biology & Microbiology

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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

Biology & Microbiology

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).

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology