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BIO 219 Exam 3 – Questions & Verified Solutions
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BIO 219 Exam 3 – Questions & Verified Solutions
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BIO 219 Exam 3 – Questions & Verified SolutionsIf fertilization is considered day 0, when do cells lose totipotency in human
development? Right Ans - Between Day 4 and Day 7, before implantation
Which cell layer will become muscles and skeleton? Right Ans - mesoderm
All cells in an organism have the same genome. Which of these is NOT a way
that most human cells regulate which of the genes in the genome are used to
create specific cell-types?
Cells can add DNA to their genomes, which gives them new functions.
Cells can regulate which proteins are functional.
Cells can regulate which genes are transcribed
Cells can regulate which mRNAs are translated
Cells can change which genes are available for transcription Right Ans -
Cells can add DNA to their genomes, which gives them new functions.
Two organisms, A and B, have approximately the same number of base-pairs
in their genomes. Organism A has more genes than organism B. In a re-
annealing experiment, Organism B's genome anneals faster than Organism A's.
What do you conclude about Organism B? Right Ans - Organism B's
genome has more repetitive DNA than Organism A's genome.
If we conducted a re-annealing experiment using human genomes, which of
these would re-anneal fastest?
A multi-copy gene, like the gene that encodes the ribosome.
Telomeric sequences
A region of the unique non-coding DNA.
A single-copy gene, like the gene that encodes RNA polymerase. Right Ans -
Telomeric sequences
, True or False, individuals with identical genomes (for example, identical
twins), have identical phenotypes. Right Ans - false
Which of the following is NOT true of DNA polymerase?
DNA polymerase builds the new strand from 5' to 3'.
DNA polymerase can start new DNA strands independently.
DNA polymerase uses dATP as a nucleotide.
DNA polymerase reads the template from 3' to 5'.
DNA polymerase uses a "guess and check" method to add nucleotides.
Right Ans - DNA polymerase can start new DNA strands independently.
Which of the following is NOT true of DNA replication?
Helicase uses ATP as an energy source.
Primase uses ATP to build primers.
Single-stranded binding proteins are enzymes that hold the strands open.
Telomerase adds nucleotides to the original DNA template.
Ligase uses a condensation reaction to make a single phosphodiester bond at
each site of ligation.. Right Ans - Single-stranded binding proteins are
enzymes that hold the strands open.
During which of the following mitotic stages do chromosomes condense using
histones? Right Ans - Prophase
During which of the following mitotic stages to microtubules shrink to pull
chromosomes to the MTOC? Right Ans - anaphase
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