BIOL121 / BIOL 121 Module 4 (Latest Update 2026 / 2027) Nutrition | Questions & Answers | Grade A | 100% Correct - Portage Learning

BIOL121 / BIOL 121 Module 4 (Latest
Update ) Nutrition |
Questions & Answers | Grade A | 100%
Correct - Portage Learning


a _______ mutation is a change in one nucleotide pair in a DNA molecule -

CORRECTANSWER point



a point mutation is a change in ______ nucleotide pair in a DNA molecule -

CORRECTANSWER one



(t/f) point mutations can occur in exons and regulatory regions of genes -

CORRECTANSWER true



a _______ point mutation is when one new nucleotide pair is inserted -

CORRECTANSWER addition



a _______ point mutation is the removal/elimination of one nucleotide from a gene -

CORRECTANSWER deletion



a ________ point mutation is when one nucleotide pair replaces another -

CORRECTANSWER substitution

,(t/f) an example of a substitution point mutation is when the TA in the wild-type allele is

converted to AT -CORRECTANSWER true



(t/f) point mutations only have a small impact and don't really cause mutations -

CORRECTANSWER false



(t/f) point mutations can have a profound impact on genes because they can scramble

all of the three letter triplets -CORRECTANSWER true



sickle cell anemia is caused by a ______ point mutation in the beta-globin molecule -

CORRECTANSWER substitution



(t/f) hemophilia, phenylketonuria, tay-sachs, color blindness, cystic fibrosis, and sickle

cell anemia are caused by point mutations -CORRECTANSWER true



hemophilia, phenylketonuria, tay-sachs, color blindness, cystic fibrosis, and sickle cell

anemia are caused by _______ mutations -CORRECTANSWER point



(t/f) there can be many point mutations in one gene -CORRECTANSWER true



WHICH STATEMENT ABOUT POINT MUTATIONS IS FALSE ?

,1. AN ADDITION POINT MUTATION ADDS ONE NEW NUCLEOTIDE PAIR TO A DNA

MOLECULE



2. A DELETION POINT MUTATION REMOVES ONE NUCLEOTIDE PAIR FROM A

DNA MOLECULE



3. A SUBSTITUTION POINT MUTATION REPLACES ONE NUCLEOTIDE PAIR WITH

ANOTHER



4. SICKLE CELL ANEMIA IS DUE TO A POINT MUTATION IN THE BETA-GLOBIN

GENE



5. POINT MUTATIONS NEVER CAUSE GENETIC DISORDERS -CORRECTANSWER

5



AN _______ POINT MUTATION ADDS ONE NEW NUCLEOTIDE PAIR TO A DNA

MOLECULE -CORRECTANSWER addition



A ______ POINT MUTATION REMOVES ONE NUCLEOTIDE PAIR FROM A DNA

MOLECULE -CORRECTANSWER deletion



A ______ POINT MUTATION REPLACES ONE NUCLEOTIDE PAIR WITH ANOTHER

-CORRECTANSWER substitution

, (t/f) SICKLE CELL ANEMIA IS DUE TO A POINT MUTATION IN THE BETA-GLOBIN

GENE -CORRECTANSWER true



(t/f)POINT MUTATIONS NEVER CAUSE GENETIC DISORDERS -

CORRECTANSWER false



a _____ point mutation is a change in typically the third nucleotide of a codon that does

NOT change the amino acid coded by the codon -CORRECTANSWER silent



a silent point mutation usually involves the ______ nucleotide in a codon -

CORRECTANSWER third



(t/f) a silent point mutation consists of usually the third nucleotide being changed

because the first and second nucleotides usually determine the amino acid that will be

coded -CORRECTANSWER true



the altered codon in a silent point mutations codes for the (same/different) amino acid -

CORRECTANSWER same



(t/f) silent point mutations do not affect the amino acid encoded, but can impact

transcription -CORRECTANSWER true