What catalyzes the formation of peptide bonds between amino acids?
a. the ribosome.
b. tRNA.
c. mRNA.
d. the neighboring amino acid.
e. the codon.
a
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Blood returning to the mammalian heart in a pulmonary vein drains first into the _____
A) vena cava B) left atrium C) right atrium D) left ventricle E) right ventricle
Which one of the following is a lophotrochozoan?
A) Crustaceans B) Arthropods C) Mollusks D) Chelicerata E) Nematoda
Modifications of bases, changes to histones, and alterations in chromatin structure involve changes to the manner in which DNA is packaged and are called ____ mechanisms of gene regulation
Fill in the blank with the appropriate word.
What makes temperate rainforests different from their tropical counterparts?
a. winters are mild and wet and summers are cool b. winters are cold and summers are mild and wet c. they receive more rain d. they contain more species e. they differ only in latitude