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BIOS 100 Exam 3
- when a single gene produces multiple effects i.e. affects more than one trait, this is known as
co-dominance:
Answer false, it's pleiotropy
- a chromosome's gene sequence that was ABCDEFG before modification and
ABCDEFEFG afterward is an example of inversion:
Answer false, it's an example of duplication
- sickle cell anemia is an example of pleiotropy, where one gene affects more than one trait:
Answer true
4. alleles are described as alternate versions of a gene:
Answer true
- chromosomes other than those involved in sex determination are known as autosomes:
Answer true
6. introns are noncoding DNA sequences:
Answer true
7. restriction enzymes are used to bind DNA fragments together:
Answer false, DNA ligase
8. mutations in DNA can lead to new alleles:
Answer true
- RNA contains the nitrogenous base thymine instead of uracil, which is only found in DNA:
- the process by which the genotype is expressed as phenotype is known as gene
Answer false, DNA contains thymine, RNA contains uracil
expression: 1 / 2
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Answer true
11. RNA splicing is the first level of control of gene transcription:
Answer false, DNA
12. in an operon the promoter acts as an "on and off" switch:
Answer false, the operator does the on and off switch
13. operon:
Answer in bacteria, cluster of genes with related functions, along with their DNA control sequences
14. sister chromatids are joined at the telomere:
Answer false, centromere
15. hydrogen chemical bond joins the bases of complementary DNA strands:
Answer true
16. the phenotype always shows the recessive allele:
Answer false, shows the dominant allele
- which cells would most likely express the genes that code for hemoglo- bin?:
- a mutation within a gene that was insert a premature stop codon in mRNA would .... ?:
Answer red blood cells
Answer result in a shortened polypeptide chain
19. many proto-oncogenes regulate:
Answer cell division
20. mutagens:
Answer UV light, chemicals, tobacco smoke, X-rays
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