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Biology 1100 Exam 2 with Complete Solutions
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Biology 1100 Exam 2 with Complete Solutions
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Biology 1100 Exam 2 with Complete SolutionsA scientist creates fruit fly larvae with a mutation that eliminates the exonuclease
function of DNA pol. Which prediction about the mutational load in the adult fruit flies is
most likely to be correct? - ANSWER-The adults with the DNA pol mutation will have
significantly more mutations than average.
Active transport across the membrane means the process needs ATP for transporting
molecules across the membrane. - ANSWER-True
Active transport does not need ATP - ANSWER-False
All prokaryotes and Eukaryotes have1) An enclosing plasma membrane2) Cytoplasm3)
DNA -- the genetic material4) Ribosomes - ANSWER-All of the above
Are Okazaki fragments are on lagging strand? - ANSWER-True
Bacterial plasma membranes is rich in phosphatidylethanolamine - ANSWER-True
Besides, phosphatidylcholine; PtdEth, phosphatidylethanolamine; PtdSer,
phosphatidylserine; PtdIns, phosphatidylinositol; there are other phospholipids for
example - PtdGro, phosphatidylglycerol; diPtdGro, diphosphatidylglycerol (cardiolipin),
PtdOH, phosphatidic acid which are nto found abundantly in plasma membrane. -
ANSWER-True
Considering a triplet code, there are 64 possible codons that code for the 20 amino
acids and 3 stop codons meaning that multiple codons can specify one amino acid. -
ANSWER-Yes
DNA polymerase can remove a wrongly inserted nucleotide. This is called its
exonuclease property. And, the process is also called proof-reading. If a mistake
escapes DNA polymerase exonuclease and is retained in daughter DNA, there are
many DNA repair machinery (made of enzymes and proteins) that can locate the
mistake (miss-incorporation) and remove it. What happens if the mistake is retained? -
ANSWER-results in mutation
Exocytosis is of two types Phagocytosis and Pinocytosis, while Endocytosis is only of
one type. - ANSWER-False
Exons and Introns are informative and non-informative parts of DNA, respectively? -
ANSWER-Yes
genetic code - ANSWER-3 connected Nucleotides in an mRNA sequence code for
amino acids - known as codons.
, If a doctor injected a patient with what was labeled as an isotonic saline solution, but
then the patient died, and an autopsy revealed that several of the patient's red blood
cells had burst, would it be true that the injected solution was really isotonic? Why or
why not? - ANSWER-False, the solution was hypotonic.
If the sequence of the 5'-3' strand is AATGCTAC, then the complementary sequence
has the following sequence: - ANSWER-3'-TTACGATG-5'
If there is no semipermeable membrane there will be no osmosis. - ANSWER-True
In DNA replication what unwinds the DNA? - ANSWER-Enzyme Helicase
In eukaryotes the sub-organelles inside the cell are enveloped by their own membranes.
These membranes are made of phospholipids too. - ANSWER-True
In which direction does DNA replication take place? - ANSWER-5'-3'
Lipid bilayer means an arrangement where to layers of lipid molecules are arranged in
such a way that polar heads make the outer boundary and hydrophobic tails are
arranged on inner side. - ANSWER-True
lysozymes are enzyme containing sacs inside the cells? - ANSWER-true
Membrane embedded proteins and phospholipids can be attached to carbohydrates
and are called glycoproteins and glycolipids, respectively. - ANSWER-True
Mitochondria are observed in plant cells that contain chloroplasts. Why do you find
mitochondria in photosynthetic tissue? - ANSWER-Mitochondria are required to break
down sugars and other materials for energy
Mitochondria are observed in plant cells that contain chloroplasts. Why do you find
mitochondria in photosynthetic tissue? - ANSWER-The nuclear membrane is part of the
endomembrane system as it is continuous with the rough endoplasmic reticulum.
mitochondrial membranes are rich in phosphatidylserine - ANSWER-True
nuclear membrane, endoplasmic membrane, membrane of Golgi complex and plasma
membrane from an end membrane system. - ANSWER-True
nucleolus assembles ribosomes - ANSWER-true
Passive transport across the membrane could be grouped into two categories, diffusion
and facilitated diffusion. Both occur without requirement of ATP. - ANSWER-True
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