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UGA, UAA, UAG are called stop codons. When found within an intron, they may interfere with protein synthesis, often resulting in a nonsense mutation.   

From the list below, how does the Y chromosome in male humans determine “maleness”?  

BONUS QUESTION: Given questions #1-10 above, select three statements you identified as “false” and re-write them to make them “true”. As you select a statement to re-write for bonus point consideration, be sure to write the original question number (Example: “I am re-writing question #7” or simply “#7”). If you do not do this, then no points shall be awarded.   When re-writing your false statements, keep each statement to one sentence. You should be able to modify a false statement to make it true by changing just a word or two. Changing a statement to simply include “not” or “don’t” (etc) is not properly re-writing a statement and shall not be accepted. Further, when re-writing your false statements, the modified true statements should pertain directly to course materials, only. Finally, if you re-write more than three statements, only the first three statements will be graded for bonus point consideration (even if an error is made in re-writing one of the first three statements and a later statement has been re-written properly).  

From the choices below (A-E in blue), which segment of double-stranded DNA would require the highest temperature for denaturation (hint: consider hydrogen bonding)?     

The structure of chromatin naturally inhibits access to DNA by transcription proteins.   

The enzyme DNA polymerase (III) adds nucleotides to the 3′ end of a nucleic acid primer.   

From the list below, which of the following is not a major feature of the Watson-Crick model for DNA?  

If a healthy male marries a woman who is a carrier of the color-blind allele (inherited on the X chromosome in an x-linked recessive manner), what is the probability their first child will be a color-blind boy (ie – their first child will be color blind AND the child will be a boy)?   

A change in the DNA sequence of a gene is called a ____.   

Consider a given trait in twins. For both twins to express the trait, they are said to be ___.