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General Biology 181
Terms in this set (39)
Which of the following statements is correct about diffusion?
It is a passive process in which molecules move from a region of higher concentration
to a region of lower concentration
According to the fluid mosaic model of cell membranes, which of the following is a true
statement about membrane phospholipids
They can move laterally along the plane of a membrane
Which of the following best summarizes the relationship between dehydration reactions and
Dehydration reactions assemble polymers, and hydrolysis break down polymers
In a plant cell, DNA may be found
in the nucleus, mitochondria, and chloroplasts
A primary objective of cell fractionation is to
separate the major organelles so that their particular functions can be determined.
Which structure is the site of the synthesis of proteins that may be exported from the cell
What results from an unequal sharing of electrons between atoms?
A polar covalent bond
Movement of vesicles within the cell depends on what cellular structures?
Microtubules and motor proteins
ions diffuse across membranes through specific ion channels
Down their electrochemical gradients
The difference between pinocytosis and receptor mediated endocytosis is that
Pinocytosis is non-selective in the molecules it brings into the cell, whereas receptor
mediated endocytosis offers more selectivity
Which plant cell organelle contains its own DNA and ribosomes?
The liver is involved in detoxification of my poisons and drugs. Which of the following structures
is primarily involved in this process and therefore abundant in liver cells?
What maintains the secondary structure of a protein?
Hydrogen bonds between the amino groups of one peptide bond and the carboxyl
group of another peptide bond
Which of the following is a reasonable explanation for why unsaturated fatty acids help keep
any membrane more fluid at lower temperatures
The double bond forms kinks in the fatty acid tails, preventing adjacent lipids from
A protein that spans the phospholipid bilayer one or more time is
A transmembrane protein
Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent
Proton pumps are used in various ways by members of every domain of organisms: bacteria,
archaea and eukarya. According to evolution theory, what does this most probably mean?
Proton gradients across a membrane were used by cells that were the common
ancestor of all three domains of life
What kinds of molecules pass through a cell membrane most easily?
Small and hydrophobic
In a liver cell detoxifying alcohol and some other poisons, the enzymes of the peroxisome
remove hydrogen from these molecules and:
Transfer the hydrogen to oxygen molecules to generate hydrogen peroxide
The advantage of light microscopy over electron microscopy is that:
Light microscopy allows one to view dynamic processes in living cells
Mammalian blood contains the equivalent of 0.15 M NaCl. Seawater contains the equivalent of
0.45 M NaCl. What will happen if red blood cells are transferred to seawater?
Water will leave the cells, causing them to shrivel and collapse
Which of the following contains hydrolytic enzymes?
Which of the following produced and modifies polysaccharides that will be secrete?
The primary function of polysaccharides attached to the glycoproteins and to glycolipids of
animal cell membranes is
To mediate cell-to-cell recognition
A bacterium engulfed by a white blood cell through phagocytosis will be digested by enzymes
In a paramecium, cell surface integral membrane proteins are synthesized
By ribosomes bound in the rough ER
Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules
The presence of cholesterol in the plasma membranes of some animals
Enables the membrane to stay fluid more easily when cell temperate drops
Water passes quickly through cell membranes because
It moves through aquaporin's in the membrane
In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell.
Where do their end up after endocytosis?
On the inside surface of the vesicles
A cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane,
and mitochondria. It could be a cell from:
Nearly any eukaryotic organism
Some regions of the plasma membrane, called lipid rafts, have a higher concentration of
cholesterol molecules. As a result, these lipid rafts:
Are more rigid than the surrounding membrane
33. The partial negative charge in a molecule of water occurs because
The electrons shared between the oxygen and hydrogen atoms spend more them
around the oxygen atoms nucleus than around the hydrogen atom nucleus
Motor proteins provide for molecular motion in cells by interacting with what types of cellular
Which of the following is a major cause of the size limits for certain types of cells?
The need for a surface area of sufficient area to support the cell's metabolic needs
Which type of organelle or structure is primarily involved in the synthesis of oils, phospholipids,
Smooth endoplasmic reticulum
Which of the following statement concerning bacteria and archaea cells is correct?
Archaea cells contain small membrane-enclosed organelles; bacteria do not
Cell membranes are asymmetrical. Which of the following is the most likely explanation?
The two sides of a cell membrane face different environments and carry our different
A cell with a predominance of free ribosomes is most likely:
Producing primarily cytoplasmic proteins
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