When an intestinal cell ingests substances inside very small vesicles that can only be seen with an electron microscope, this is
d. active transport.
Radioactive isotopes are used to tag proteins in the cell membranes of mouse cells. These cells are then fused with human cells in cultures. What is the likely consequence of the tagged mouse proteins?
a. The tagged proteins remain in the mouse cells and keep their position on the membrane.
b. The tagged proteins remain in mouse cells but move anywhere across the mouse cell membrane.
c. The tagged proteins drift across cell membranes and are soon found dispersed across both human and mouse cell membranes.
d. None of these will occur since mouse cell membranes are unlike human cell membranes.
e. None of these will occur since radioactive cells will soon die.
If the diploid chromosome number is 16, the chromosome number of each gamete will be
a. contains RNA and is found in the nucleus.
b. contains DNA and is found in the nucleus.
c. contains RNA and is found in the cytoplasm.
d. contains DNA and is found in the cytoplasm.
e. contains ribosome subunits and is found in the cytoplasm.
If the mitochondrion is the result of endosymbiosis, what membrane of the mitochondrion represents the engulfing vesicle?
a. the outer mitochondrial membrane
d. thylakoid membrane
Which is NOT a correct association?
a. S stage-DNA synthesis
b. M stage-mitosis and cytokinesis
c. interphase-shortest stage of the cell cycle
stage-cell grows in size and cell organelles increase in number
stage-metabolic preparation for mitosis
The only function of apoptosis is to destroy healthy cells when they become damaged or infected.
During what stage of mitosis does the nuclear envelope disappear and the chromosomes become distinct?
If a particular molecule is brought into the cell by receptor-medicated endocytosis, then changing the receptors will change the molecule that is being transported.
Microtubules found in spindle fibers are capable of assembling and disassembling.
Which of these is present in plant, but not animal, cells?
c. cell membrane
d. Golgi apparatus
Which membrane transport process can continue whether the cell is alive or dead?
a. sodium/potassium pump
Which is true of facilitated transport by carrier proteins?
a. Facilitated transport only applies to small and lipid soluble molecules.
b. It is represented by the glucose carrier that can transport hundreds of molecules a second.
c. After a carrier has transported a molecule, it is unable to transport any more.
d. Facilitated transport requires expenditure of chemical energy and is therefore active transport.
e. One carrier protein can carry a variety of different molecules.
During photosynthesis, solar energy is converted to chemical energy by the chloroplasts. The process is represented by:
a. carbohydrate + oxygen ® carbon dioxide + water + energy
b. carbohydrate + carbon dioxide ® oxygen + water + energy
c. solar energy + oxygen + water ® carbohydrate + oxygen
d. solar energy + carbon dioxide + water ® carbohydrate + oxygen
e. solar energy ® carbohydrate + oxygen
Which of the following best characterizes apoptosis?
a. Apoptosis is bad for an organism.
b. The stages of apoptosis are different in each cell type.
c. Apoptosis happens accidentally to healthy cells.
d. Apoptosis plays a normal role in development and cancer prevention.
e. Apoptosis results in our going from a fertilized egg to trillions of cells.
In the emergency room, saline solutions are often run into a person's vein. The saline solution must be
a. 0.1% NaCl
b. 0.5% NaCl
c. 0.75% NaCl
d. 0.9% NaCl
e. 9.0% NaCl
During which phase will homologous chromosomes separate?
a. Anaphase I
b. Anaphase II
e. Metaphase I
Which of the following is a prokaryotic cell?
a. plant cell
b. liver cell
c. muscle cell
The desmosome junctions would pull together more tightly creating an impermeable barrier.
a. adhesion junctions
b. gap junctions
c. tight junctions
e. None of these are found between skin cells.
Which eukaryotic organelle is the largest?
e. Golgi apparatus
A differentially permeable membrane separates a molasses solution from distilled water. Over time, the
a. molasses will be found in the water.
b. molasses will become more dilute.
c. molasses solution will become more concentrated.
d. molasses will be found in water and it will be more concentrated.
e. solutions will remain the same.
Centrioles are necessary to the process of mitosis in all organisms.
Which is NOT a function of the cytoskeleton?
a. maintains a cell's shape
b. anchors organelles in place within a cell
c. allows cell and its organelles to move
d. secretes the calcium for bone tissue
e. allows the formation of pseudopodia
Since all organisms carry on cellular respiration, all living cells must contain mitochondria.
One difference between spermatogenesis and oogenesis is
a. spermatogenesis results in three times more cells.
b. spermatogenesis produces polar bodies in an effort to keep nutrients for the one sperm cell.
c. oogenesis produces polar bodies in an effort to keep nutrients for the one egg cell.
d. spermatogenesis results after fertilization.
e. oogensis produces 2 eggs and spermatogenesis produces 4 sperms.