The fusion of gametes during fertilization restores the ____________________ number of chromosomes
Fill in the blank(s) with correct word
diploid
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What is clonal selection with regard to B cells? How does it occur?
What will be an ideal response?
Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that _____
A) solution Y has no free hydrogen ions (H+) B) the concentration of hydrogen ions in solution Y is 1000 times as great as the concentration of hydrogen ions in solution X C) the concentration of hydrogen ions in solution X is 3 times as great as the concentration of hydrogen ions in solution Y D) the concentration of hydrogen ions in solution X is 1000 times as great as the concentration of hydrogen ions in solution Y
How is the four-letter language of nucleic acids converted into the twenty-word language of amino acids?
a. The four nucleic acid bases combine in two-letter combinations that define different amino acids. b. The four nucleic acid bases combine in three-letter sequences that define different amino acids. c. Triplets of the two-letter nucleic acid bases are translated into the twenty different amino acids. d. The four bases each specify one amino acid, which in combination give rise to the remaining sixteen amino acids. e. The four bases are first converted into tRNA molecules, which can each attach to five amino acids.
Which of the following does NOT occur in prophase I of meiosis?
A) Condensation of chromatin B) Tetrad formation C) Crossing over D) Synapsis E) Cytokinesis