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23 terms

Ch. 15

STUDY
PLAY
What name is given to the process in which a strand of DNA is used as a template for the manufacture of a strand of pre-mRNA?
transcription
What name is given to the process in which the information encoded in a strand of mRNA is used to construct a protein?
translation
What name is given to the process in which pre-mRNA is edited into mRNA?
RNA processing
Polypeptides are assembled from _____.
amino acids
RNA processing converts the RNA transcript into _____.
mRNA
What is expected to happen to the number of Alzheimer's patients in the U.S. in the near future?
It is expected to increase.
Who is financing this large clinical drug trial?
federal government, private donors, and the drug company
If this drug works, it will show what?
That amyloid plaques are the underlying cause of some forms of Alzheimer's.
You are an Alzheimer's patient. Which of the following tests should you have in order to see if your brain is shrinking?
MRI scan
You are an Alzheimer's researcher. You find a sample of cerebral spinal fluid with high tau levels. What does this indicate?
That patient has many dying brain cells.
Beginning within the nucleus, the first step leading to the synthesis of a polypeptide is _____.
transferring of information from DNA to messenger RNA
True or false? A codon is a group of three bases that can specify more than one amino acid.
False
Which of the following statements about mutations is false?
A knock-out mutation results in a total absence of the mutated protein.
If a DNA sequence is altered from TAGCTGA to TAGTGA, what kind of mutation has occurred?
Deletion.
Which mutation(s) would not change the remainder of the reading frame of a gene sequence that follows the mutation(s)?
One addition and one deletion mutation.
If the sequence ATGCATGTCAATTGA were mutated such that a base were inserted after the first G and the third T were deleted, how many amino acids would be changed in the mutant protein?
Two.
If a mutated DNA sequence produces a protein that differs in one central amino acid from the normal protein, which of the following kinds of mutations could have occurred?
An addition mutation and a deletion mutation.
Generally speaking, which of the following mutations would most severely affect the protein coded for by a gene?
a frameshift deletion at the beginning of the gene
Suppose a diploid cell with three pairs of homologous chromosomes (2n=6) enters meiosis. How many chromosomes will the resulting gametes have in each of the following cases?
Meiosis occurs normally
3 only
Suppose a diploid cell with three pairs of homologous chromosomes (2n=6) enters meiosis. How many chromosomes will the resulting gametes have in each of the following cases?
Nondisjunction of one chromosome pair in meiosis I.
2 or 4
Suppose a diploid cell with three pairs of homologous chromosomes (2n=6) enters meiosis. How many chromosomes will the resulting gametes have in each of the following cases?
Nondisjunction of all three chromosome pairs in meiosis I.
0 or 6
Suppose a diploid cell with three pairs of homologous chromosomes (2n=6) enters meiosis. How many chromosomes will the resulting gametes have in each of the following cases?
Nondisjunction in one chromosome in one daughter cell in meiosis II.
2, 3, or 4
Suppose a diploid cell with three pairs of homologous chromosomes (2n=6) enters meiosis. How many chromosomes will the resulting gametes have in each of the following cases?
Nondisjunction in all three chromosomes in one daughter cell in meiosis II.
0, 3, 6.