BIOL 133 Exam 3 - Chapters 12-15

BIOL 133 Exam 3 - Chapters 12-15 Part 1 of 1 -85.0/ 100.0 Points Question 1 of 40 2.5/ 2.5 Points The part of the gene that is designated as +1 is also known as

• the initiation site

Feedback: Correct

Question 2 of 40 2.5/ 2.5 Points Your labmate’s ligation reaction didn’t work. The regular ATP had run out, so he fueled the reaction with dATP from the PCR kit. What advice can you give him?

• Remind Sam that dATP is not the same as ATP.

Feedback: For synthesizing DNA in PCR, nucleotides may be provided in separate tubes of dATP, dCTP, dGTP, and dTTP. Because these are deoxyribonucleotides, they do not have the same structure as ATP, and therefore cannot be used as energy currency molecules to drive a ligation reaction.Question 3 of 40 2.5/ 2.5 Points An organism with nonfunctioning telomerase

• would have shorten chromosomes earlier than normal cells

Feedback: Learning Objective: State the role of telomerase in DNA replication 1 / 2

Question 4 of 40 2.5/ 2.5 Points The allele for widows peak (H) is dominant for the allele for no widows peak (h). At a different gene locus, the allele for hitchhikers thumb (D) is dominant to the allele for non- hitchhikers thumb (d). A man is heterozygote for the traits and marries a woman who has no widows peak and is heterozygote for hitchhikers thumb. What is the man’s genotype?

• HhDd

Feedback: Learning Objective: Use the forked-line method and the probability rules to calculate the probability of genotypes and phenotypes from multiple gene crosses Question 5 of 40 2.5/ 2.5 Points Due to a random error by the aminoacyl tRNA synthetase, a tRNAVal was misloaded with Ile. What do you predict will result?

• One protein will get Ile inserted where Val was supposed to go, leading to minor structural

change in the protein.Feedback: Learning Objective: Analyze how genes determine the proteins found in all cells Question 6 of 40 2.5/ 2.5 Points What statement describes X-linked traits? Select all that apply.

• Women can be carriers because they can be heterozygous for the trait
• X-linked traits are more common in men
• Males are never carriers since they only receive one X chromosome

Feedback: Learning Objective: Identify non-Mendelian inheritance patterns such as incomplete dominance, codominance, recessive lethals, multiple alleles, and sex linkage

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