Question

column a

1. operator
2. operon
3. promoter
4. gel electrophoresis
5. polymerase chain reaction

column b
a. a method widely used in molecular biology to rapidly make
millions to billions of copies of a specific dna sample
allowing scientists to take a very small sample of dna and
amplify it to a large enough amount to study in detail
b. a unit made up of linked genes which is thought to regulate
other genes responsible for protein synthesis.
c. the site on the dna where rna polymerase binds in order to
start transcription.
d. the site on the dna where a repressor protein binds and
blocks the rna polymerase from making mrna.
e. a technique used to separate dna fragments according to
their size. dna samples are loaded into wells (indentations)
at one end of a gel, and an electric current is applied to pull
them through the gel.
question 30
an error in meiosis (or mitosis) leading to the wrong number of chromosomes is called _.
point mutation
nondisjunction
oopsy
replacement

Explanation:

• Point mutation: A change in a single nucleotide base in DNA. This does not affect the number of chromosomes.
• Nondisjunction: During meiosis (or mitosis), chromosomes fail to separate properly. This leads to daughter cells with an incorrect number of chromosomes.
• Oopsy: Not a scientific term related to chromosome number errors in cell division.
• Replacement: A general term not specific to the described chromosomal error in cell division.

Answer:

B. nondisjunction