Upgrade to remove ads
BIOL 240 FINAL
Terms in this set (96)
The cell membrane is formed by two layers of phospholipids. Therefore the thickness of the cell membrane is wishing the size rate of:
A ribosome is typically 20 nm big which equals _____ micrometers
A transmission electron microscope (TEM) picture of a yeast cell is shows to the right. Which of the following is FALSE about the cell?
The organelle indicated by an arrow is a giant vesicle.
The central dogma of molecular biology refers to
transcription and translation
Most elements are neutral because they have an equal number of electrons and protons. Normal carbon, 12C, has 6 electrons, 6 protons, and 6 neutron but the rare carbon form, 13C, has an additional neutron. Which of the following is true about 13C?
It weighs heavier than 12C.
Covalent bond is formed when two elements
Which of the following statement is FALSE about polar molecules?
They are also called amphipathic
Hydrophobic repulsion is likely to occur between
H20 and CH4 (methane)
Isomers are molecules that:
Have the identical chemical formula but different chemical structure
The chemical reaction 1 shown on the right depicts how two monosaccharides combine to form a disaccharide. Reaction 2 is the revers reaction to break down a disaccharide into two monosaccharides. Which of the following is true?
Reaction 1 is called a dehydration reaction
Carbohydrates carry out many functions for the cell. Which of the following is a correct match
Enhancing white blood cell function- beta glucan
The prefix beta 1,3- of a polysaccharide name means that:
The glycosidic bonds in the polysaccharide are formed between C1 and C3 of every two neighboring monosaccharides.
Lactose is a type of disaccharide formed by
glucose and galactose
Which of the following is true about fatty acids?
They are amphipathic
Phospholipids consist of the following EXCEPT
Phosphotidylinositol is a type of phospholipid that is asymmetrically distributed on the cell membrane. It is mostly located on:
the cytosolic side of the cell membrane
What is the domain that protein A is located?
Which of the following is amphipathic?
Which of the following is TRUE about cholesterol?
It is the precursor of steroid hormones
Proteins make up _______% of cellular content
Which of the following statements is true about peptide bonds?
They form between the carboxyl group and amino group of two amino acids.
The correct one-letter abbreviation for the peptide with the following amino acids: Asp-Asn-Tyr-Thr-Ile
Which of the following statement is FALSE about protein structure?
A protein usually can form into several interchangeable 3-D structures while maintaining the same function
When a protein is denatured
it loses its 3 dimensional structure
Which of the following is TRUE about prion diseases
They commonly cause cell death and tissue collapse in the nervous system
Which of the following is TRUE about the 'domain' of protein structure?
It is usually the part of a protein that has enzymatic activity.
Differential centrifugation is a common method to fractionate cell homogenate. Which cell component can only be brought down to a pellet by ultra high speed centrifugation
In the cell diversity lab, the unique bi-concave shape of mature red blood cells is due to the
absence of nucleus
To measure the size of a cheek cell, you prepare a slide of stained cheek cells and examine them under a compound microscope at 400x magnification. Two cheek cells are aligned with the ruler (2.5 micrometers/bar) What is the diameter of the lower cell (arrow)?
hematoxylin and eosin (H&E) staining is a common histological method that stains the nuclei in ______ and cytoplasm in ______
To pipet 5.5 microliters solution, you use the ______ micropipettor and turn the setting knob to set the three digits at _____ (from top to bottom)
A spectrometer allows you to
measure the amount of color substance in a solution
the letter "d" is put under a compound microscope, what will it look like in the eyepiece?
Below is a phase contrast image of a hermaphroditic nematode. Name the structure pointed by an arrow.
C. elegans is a very good genetic tool for research because of the following advantages EXCEPT
each generation has about the equal number of males and hermaphrodites
In the C. elegant lab, you studied the dpy mutant worms which has a shorter but thicker body. What causes the dpy worms to be short and fat?
The mutation causes weaker cuticles in the dpy worm
Which of the following is NOT found in all cells?
In the TEM picture on the right, the organelle at the end of the arrow is called
Which of the following is TRUE about the organelle on the right?
It is the energy production center of the cell
The following organelles are made of two layers of membrane EXCEPT
In the TEM picture on the right, the arrow points to
Which organelle contains no DNA
The highest resolution that you can get with a light microscope is
The basic design of the fluorescence microscope is shown on the right. Which of the following is true?
The filter 1 allows a particular wavelength of light to reach the specimen.
Immune-Staining, illustrated by the diagram on the right, is an important cell biology method using antibodies. Which of the following is true about this method?
The "D" molecule is called antigen
Which of the following can NOT diffuse across a cell membrane?
Which of the following is true about passive transport
It can be done by carrier proteins and ion channels
Which of the following ion is purposely kept at high concentration on the INSIDE of the cell
Which of the following is TRUE about the glucose transport across intestinal epithelial cells
Na+ and glucose are transported together from intestine lumen into the cell
All of the following are required for neurotransmitter release EXCEPT
Closed Ca+2 channels
A neuron that is exposed to a Ca+2 channel blocker, a drug that inhibits Ca+2 channel from opening will be
able to polarize, but no Ca+2 will enter the presynaptic membrane
Synaptic transmission of a nerve impulse is important because it allows the impulse to be transmitter
in 1 direction only
Which of the following experimental observations would provide the best evidence that synopsis is necessary for the release of neurotransmitters?
A mutant cell line of neurons lacks only synapses and is incapable of releasing neurotransmitters
The release of neurotransmitter vesicle involves all of the following processes EXCEPT
fusion of the golgi apparatus with the presynaptic membrane
What is the most likely function of synopsis in the process of neurotransmitter release?
to prevent premature release of neurotransmitter
Which of the following is false about ion channels?
They transport ions across a membrane against the concentration gradient
When an Na+ ion channel si in the inactivated conformation
the ion channel won't respond to any stimulus
At the synapse, the electrical signal of an action potential is converted to chemical signal, which then travels through the synaptic cleft reaching the receptors on the postsynaptic membrane. Which of the following is FALSE?
The chemical signal is usually stable and stays in the synaptic cleft for a long time
Which of the following is TRUE about the "a" mV of the membrane potential
It is usually -60mV
Which of the following is TRUE about the "c" mV of the membrane potential
It is due to high concentration of Na+ inside the cell
Which of the following is FALSE about NO (nitric oxide)
it causes opening of ion channels
Which of the following is TRUE about the G-protein-coupled receptors
After binding with a signal molecule, they cause separation of G(alpha) and G(beta gamma)
Enzyme coupled receptors typically _______________ after signal molecules bind to them
dimerize and phosphorylate each other
Which of the following is TRUE about the fast response triggered by a signal molecule?
The signal alters protein functions
The structure in the C. elegant that functions like a human brain is called
On the right is a graph from a chemotaxis experiment. Which of the following is a correct interpretation
The T-L is a chemoattractant because the P(control vs T-L) is 0.03
According to the base pairing rule, you would expect any section of DNA to contain equal numbers of
A and T
Which of the following is FALSE about human chromosomes
Replication origins are located at the ends of the chromosomes
For a trait to show 3:1 phenotypic ratio in a monohybrid cross, the trait has to be determined by
one genes with two alleles
In genetics, the Law of Independent Assortment means
the alleles of different traits assort independently
If a child belonged to blood type O, he or she could not have been produced by which set of parents?
type AB mother and type O father
A curly haired person and a straight haired person mate and all their offspring have wavy hair . What is the chance for a couple both with wavy hair to a child with straight hair?
The fur color of a Siamese cat (shown on the right) is due to
temperature sensitivity of the black allele
DNA replication starts at ore sites which have the following features EXCEPT
they usually form more hydrogen bonds than non-ore sequences
Which of the following statement is FALSE about telomeres
Transcription usually starts at telomeres
Which of the following is TRUE about the double-strand break DNA damage
double-stranded break usually causes deletion mutation
Which of the following is TRUE about the "New strand A"
it is called leading strand because it is replicated continuously
Which of the following is TRUE about the "New strand B"
It will be joined with the neighboring fragments by DNA ligase
DNA replication is called semi-conservative which means
each new DNA contains 50% old nucleotides and 50% new nucleotides
Genetic engineering typically involved cloning DNA of interest into a vector. Plasmid is one of the commonly used vectors. Which of the following is FALSE about plasmids?
Plasmid can be used to clone up to 50 kb long DNA
Which of the following is NOT required for PCR reaction?
PCR reaction typically goes through cycles of three temperatures: 94C, 55C, 72C. What happens during the 55C step?
Primers pair to the template
Bacterial RNA polymerase is composed of five subunits, two alpha, one beta, one beta prime, and one sigma. The function of the sigma subunit is to
bind to the promoter of a gene
In bacteria transcription starts with RNA polymerase binding to
-35 qnd -10 promoter regions
In bacteria transcription stops when
the transcribed RNA forms a GC hairpin loop
In eukaryotic cells, transcription of mRNA starts with
TFII D binding to TATA box
There are three RNA polymerases in eukaryotic cells. Which of the following is a CORRECT match of the RNA polymerase and the type of RNA they transcribe?
RNA polymerase II - microRNA
The similarity between transcription and DNA replication is that
they both synthesize new nucleic acid in the 5' to 3' direction
What's the genotype of the cells in the A/D section?
The cells in the U/D section didn't grow because
they had trp mutation
Your unknown is the _______ strain
What's the mating type of your neighbors unknown strain (N)?
In the second experiment, you plated your unknown, A, and D strains on the SD-ade and SD-trp selection media, both contain essential growth materials except adenine and tryptophan, respectively. Your unknown was found to grow on the SD-ade, but not on the SD-trp, plate shown on the right. What's the ade and trp genotype for your unknown?
Ultraviolet light in the sunlight can be divided into three categories: UV-A, UV-B, and UV-C. Which of the following is false?
The most significant type of UV-induced DNA damage is depurination
In the yeast sunscreen lab, 10 second of UV exposure causes no growth of the cells because
the yeast strain is not able to repair the damages caused by UV
In the restriction enzyme lab, we preformed gel electrophoresis to analyze the DNA fragments. Which of the following is FALSE about gel electrophoresis?
Samples are loaded into the gel on the red (+) electrode side.
You might also like...
Cell and Molecular- old test questions
Physiology Exam 2
Cell Biology Exam 4 (OLD)
Bio 183 practice final
Other sets by this creator
MCAT Biochemistry Review
Biochem Final Exam
PSYCH / SOC
Microbiology Ch. 14