Module 4 Cell Growth, Reproduction, and Heredity Flashcards
A diploid cell has _______ the number of chromosomes as a haploid cell.
twice
An organism’s traits are determined by the specific combination of inherited _____.
genes
Identical copies of chromatin held together by cohesin at the centromere are called _____.
sister chromatids
Chromosomes are duplicated during what stage of the cell cycle?
S phase
The mitotic spindles arise from which cell structure?
centrosome
Unpacking of chromosomes and the formation of a new nuclear envelope is a characteristic of which stage of mitosis?
telophase
Many of the negative regulator proteins of the cell cycle were discovered in what type of cells?
cancer cells
_______ are changes to the order of nucleotides in a segment of DNA that codes for a protein.
gene mutations
A gene that codes for a positive cell-cycle regulator is called a(n)…
proto-oncogene
The crossover events are the second source of genetic variation produced by meiosis.
false
Meiosis is the nuclear division that forms diploid cells.
false
In metaphase I, the microtubules pull the linked chromosomes apart.
false
Meiosis usually produces ________ daughter cells.
four haploid
During meiosis II, the sister chromatids within the two daughter cells separate, forming six new haploid gametes.
false
Sexual reproduction requires fertilization, a union of four cells from two individual organisms.
false
A diploid, multicellular life-cycle stage that gives rise to haploid cells by meiosis is called a ________.
sporophyte
Germ cells are specialized cells that produce gametes.
true
A ___________occurs when a chromosome segment dissociates and reattaches to a different, nonhomologous chromosome.
translocation
The number and appearance of chromosomes including length, banding pattern, and centromere position is called __________.
karyotype
The gain of an extraneous chromosome is called __________.
trisomy
An organism with more than the correct number of chromosome sets (not just an extra chromosome) is called __________.
polyploid
The first level of DNA organization in a eukaryotic cell is maintained by which molecule?
histone
Which eukaryotic cell-cycle event is missing in binary fission?
karyokinesis
FtsZ proteins direct the formation of a _______ that will eventually form the new cell walls of the daughter cells
septum
Name the processes that eukaryotic cell division and binary fission have in common.
DNA duplication, segregation of duplicated chromosomes, and division of the cytoplasmic contents
The formation of what structure, that will eventually form the new cell walls of the daughter cells, is directed by FtsZ?
septum
Which of the following events does not occur during some stages of interphase?
separation of sister chromatids
Attachment of the mitotic spindle fibers to the kinetochores is a characteristic of which stage of mitosis?
prometaphase
Separation of the sister chromatids is a characteristic of which stage of mitosis?
anaphase
The chromosomes become visible under a light microscope during which stage of mitosis?
prophase
What structure is formed when the Golgi vesicles fuse at the metaphase plate of dividing plant cells?
cell plate
At which of the cell-cycle checkpoints do external forces have the greatest influence?
G1 checkpoint
If the M checkpoint is not cleared, what stage of mitosis will be blocked?
anaphase
Which protein is a positive regulator that phosphorylates other proteins when activated?
cyclin-dependent kinase (Cdk)
Which negative regulatory molecule can trigger cell suicide (apoptosis) if vital cell cycle events do not occur?
p53
Which molecule is a Cdk inhibitor that is controlled by p53?
p21
_________________cells are the result of the first meiotic division of a diploid cell.
two haploid
At metaphase I, homologous chromosomes are connected only at what structures?
chiasmata
If a muscle cell of a typical organism has 32 chromosomes, how many chromosomes will be in a gamete of that same organism?
16
The pea plants used in Mendel’s genetic inheritance studies were diploid, with 14 chromosomes in somatic cells. Assuming no crossing-over events occur, how many unique gametes could one pea plant produce?
128
At which stage of meiosis are sister chromatids separated from each other?
anaphase II
During ________, the chromosomes arrive at opposite poles and begin to decondense.
telophase II
Which of the following is not true regarding crossover?
chiasmata are formed
The sister chromatids are pulled apart by the kinetochore microtubules and move toward opposite poles during which phase?
anaphase II
Overall, meiosis II resembles the ____________ division of a haploid cell.
miotic
What is a likely evolutionary advantage of sexual reproduction over asexual reproduction?
sexual reproduction results in variation of the offspring
Which type of life cycle has both a haploid and diploid multicellular stage?
alternation of generations
What is the ploidy of the most conspicuous form of most fungi?
haploid
Hydras and jellyfish both live in a freshwater lake that is slowly being acidified by the runoff from a chemical plant built upstream. Which population is predicted to be better able to cope with the changing environment?
jellyfish
________________ corresponds to phenotypically male individuals with small testes, enlarged breasts, and reduced body hair.
klinefelter syndrome
A chart displaying a person’s chromosomes is called a ________.
karyogram
A human has 22 pairs of autosomes and two sex chromosomes; this human is considered to be a _______.
euploid
The distinct color in tortoiseshell cats, where different areas of fur display different colors is an example of what chromosome process?
X inactivation
______occurs when a segment of a chromosome dissociates and reattaches to a different, nonhomologous chromosome.
translocation
Jacobsen syndrome is a genetic disorder that results in the loss of the long arm of chromosome 11. This is an example of…
monosomy
Which conclusion regarding the identity of the unknown organism is correct? The organism is:
prokaryotic, as the organism lacks a nucleus.
Cells grown under anaerobic conditions experience which of the following?
the absence of oxygen
Why did the scientists most likely include glucose in the growth medium?
as a source of energy
The scientists most directly assessed the function of which organelle by using the growth conditions described?
mitochondria
Which process best describes the activity of neurotransmitters once an electrical signal reaches an axon terminal?
exocytosis, which requires ATP
Which ion movements are most likely observed along the axon?
inward movement of sodium and outward movement of potassium
What is a consequence of neurotransmitters not reentering the axon terminal? (Choose all that apply.)
increased ion entry into a target neuron; decreased signaling between neurons
Which mechanism best describes the effect of the saline solution on erythrocyte function?
The solution is hypertonic, which causes water to exit from the cell.
In terms of osmosis, which event most likely occurs upon placement of the plant cell in the saline solution?
Water exits the cell and there is a decrease in turgor pressure.
Which hypothesis is most consistent with morphology of the unknown cell upon being placed in the saline solution?
The cell has a low number of aquaporins.
A mutation to collagen-encoding DNA prevents the synthesis and processing of collagen at the step involving which organelle?
ribosome
Which statement accurately describes the synthesis and transport of the organelle responsible for the production of collagen protein? The organelle is…
synthesized in the nucleolus and resides outside the nucleus.
The enzyme responsible for modifying the collagen precursor protein is most likely located where?
rough endoplasmic reticulum
Of the following, which process is altered by Compound X?
mitosis, which is decreased
What stage of cell division is affected by Compound X?
anaphase
How does Compound X most directly contribute to the progression of cancer? Compound X…
inhibits cancer through modifying cell division.
Which metabolic processes predominate in Compound X treated cells?
glycolysis and anaerobic respiration
If yeast cells were treated with Compound X, what would the most likely molecular end product be?
ethanol
In order to produce glucose, what is the initial energy source used by the plant being engineered, regardless of season?
sunlight
Compared to the summer months, which change is expected to occur during the winter months in the plant being engineered?
decreased production of O2
During periods of light, the formation of which molecules allow for continued glucose synthesis during periods of dark?
NADPH and ATP
In the engineered plant, how are organic molecules most likely stored during the winter months?
starch
A researcher examined the effect of aspirin on heart rate in humans. He gathered data from 5,000 individuals and took their heart rates at the start of the experiment. He continued to measure their heart rates every day for 30 days. For each of those 30 days, 2,500 individuals took 5 mg of aspirin daily, and 2,500 individuals took 10 mg of aspirin daily. What is his control for this experiment?
the heart rate of the individuals during the start of the experiment
In your experiment on the effect of heart rate, you measured your heart rate in beats per minute as well as how difficult it was for you to breathe after each exercise. What was the qualitative observation in your study?
the level of difficulty breathing
A researcher is interested in the effect of stress on college students. She gives them a survey and asks a number of questions. Which of these questions would provide quantitative data for her study?
how many days have you missed due to stress?
Giant pandas mark their territory by urinating on trees.They make efforts to appear larger than other giant pandas by urinating as high on the tree as possible. They have taken this to the extreme by doing handstands when they mark the trees. Locals say that the pandas prefer urinating on trees with soft, mossy bark to trees with rough, coarse bark. You design an experiment to test this hypothesis. What is the independent variable of your experiment?
type of tree bark (soft or course)
A student wants to test the following hypothesis: “Higher levels of the pesticide Atrazine will cause increased mortality in human cells.” He places 15 cells in one well plate and adds 0.2 ng of Atrazine to each well, 15 cells in a well plate with 0.4 ng of Atrazine added, and 15 cells in a well plate with 0.6 ng of Atrazine added. The cells are kept in the same incubator prior to treatment with Atrazine. He then counts the number of cells alive in each well plate after 48 hours. Based on his data, he concludes that higher levels of Atrazine are more deadly to human cells. What is wrong with his experiment?
he had no control group
You are using the virtual microscope and see a cell with a clear nucleus and organelles, but it lacks a cell wall. Based on the options, from what organism could this cell originate?
giraffe
You are watching a paramecium swim under the microscope, and it is swimming to the left of center under the 4X objective. When you switch to the 10X objective, you can no longer see the paramecium, even when the image is in focus. What has happened?
When you increased the magnification, the field of view decreased, leaving you to look at the center of the image, leaving the paramecium off to the left.
You are using the virtual microscope with the 4X objective and move the fine focus knob as far as it will go, but still cannot get the image into focus. What is wrong?
You need to start with coarse focus when focusing on the image the first time.
If the process of meiosis I starts with one cell that contains 24 chromosomes in 12 homologous pairs, what will be the end result when meiosis II is complete?
four cells with 12 chromosomes in zero homologous pairs
Looking at a slide of cells from an oak leaf, most cells will be in which phase?
interphase
Which tissue is likely to have the largest percentage of cells undergoing mitosis?
the growing shoot of a tomato plant
A student is in the lab, and the instructor says to pull out the microscope slides that show the process of meiosis. There are four slide options in the slide box. Which should be chosen to see meiosis?
frog testis
After cutting one’s hand, the cells need to divide rapidly to heal the wound. If one could look at those cells under the microscope, what would one find?
a large number of cells undergoing mitosis
