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Biology Chapter 12 Test
Terms in this set (18)
The order of nitrogenous bases in DNA determines the order of ____ in proteins.
What makes up a nucleotide found in DNA?
1 sugar molecule, 1 phosphate molecule, and 1 of the 4 bases (ATCG)
How many codons are needed to specify three amino acids?
Unlike DNA, RNA contains ____.
DNA replication results in two DNA molecules,
A. each with two new strands.
B. one with two new strands and the other with two original strands.
C. each with one new strand and one original strand.
D. each with two original strands.
During mitosis, the
A. DNA molecules unwind.
B. histones and DNA molecules
C. DNA molecules become more tightly coiled.
D. Nucleosomes become less tightly packed.
Which type(s) of RNA is(are) involved in protein synthesis?
mRNA, rRNA, and tRNA
During transcription, an RNA molecule is formed
A. That is complementary to both strands of DNA.
B. That is identical to part of a single strand of DNA.
C. That is double-stranded.
D. Inside the nucleus.
Proteins that bind to regulatory sites on ____ determine whether a gene is expressed.
Which of the following terms is LEAST closely related to the others?
Which type of RNA functions as a blueprint of the genetic code?
What are examples of a gene mutation?
Cancer, down syndrome, less or more body parts than usual
There is no ____ that is specified by a stop codon on an mRNA molecule.
In eukaryotes, proteins that attract RNA polymerase bind to ____ sequences in DNA.
Contrast the functions of the three main types of RNA.
tRNA-transfers each amino acid to the ribosome,mRNA-sends messages to the rest of the cell, rRNA-form ribosomes
Describe the structure of a DNA molecule.
Double helix, uses letters ACGT
Mendel might have been surprised to learn that genes simply contain the instructions for assembling proteins. What do proteins have to do with the phenotype of an organism?
Proteins will determine if an organism is muscular, tall, or short.
Why do some kinds of point mutations cause greater changes in proteins than others?
They occur in a single point in a single point in the DNA sequence.
Recommended textbook explanations
Kenneth R. Miller, Levine
Texas Science Fusion: Grade 6
Kenneth R. Miller, Levine
Pearson Texas Interactive Science Grade 7
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