weekly quizzes questions Flashcards
(35 cards)
the class of organic molecules defined by a physical property rather than a structure are the…
lipids
which component of amino acids differs from one amino acid to another?
the side chain
an organic molecule must contain which element?
carbon
what feature of noncovalent molecular interactions makes them so important to life?
they are weak in a cellular environment so they can be made broken and reformed easily
a bacterial cell, a plant cell, and an animal cell have which structure in common?
cytoplasm
the random movement of molecules within a solution is reffered to as?
diffusion
the plasma membrane is composed of a phospholipid bilayer and associated proteins. What else is commonly found in the plasma membranes of animal cells?
cholesterol
which bacterial growth phases shows a net zero population growth rate?
lag and stationary
secondary structure is characterized by which type of interactions?
hydrogen bonding within the peptide backbone
the fully folded structure of a functional protein composed of a single polypeptide chain is referred to as
tertiary structure
exceptions to the central dogma
viruses
in a deoxyribonucleotide, what chemical group is found at the 2’ carbon of the sugar component?
a hydrogen
in the process of transcription, the RNA transcript is synthesized in what direction
5’ to 3’
transcription continues until
a terminator sequence is encountered
in E.Coli the molecule responsible for promoter recognition is referred to as
the sigma factor
a polymerization reaction is made irreversible by
hydrolysis of a pyrophosphate group
in prokaryotes, the process of transcription and translation are said to be coupled, which means that…
they are coupled in space and time
alternative splicing means that….
different spliced forms contain different combinations of exons
a peptide bond between two amino acids is catalyzed by…
the rRNA component of the large subunit of a ribosome
in what order does a charged tRNA move through the sites of a ribosome?
the tRNA binds with the A site, then is moved to the P site then the E site as the ribosome shifts
when a peptide bond is created between two amino acids how do they join?
the carboxyl group of the first amino acid is joined to the amino group of the second
how many different types of aminoacyl tRNA synthetases are there?
20
which type of protein interacts directly with a stop codon?
release factor
in prokaryotes, inducers are small molecules that bind to_____ and ______ transcription
repressors and promote transcription
