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Edinboro University of Pennsylvania
Biology Bio 103
Biology Bio 103
Edinboro University of Pennsylvania
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The reactions that produce molecular oxygen take place in
the light reactions alone
A flask containing photosynthetic green algae and a control flask containing water with no algae are both placed under a bank of lights, which are
the dissolved oxygen in the flack with algae will be higher in the light, but lower in the dark
In a plant leaf, the reactions that produce NADH occur in
neither the light reactions nor the calvin cycle
Reactions that require CO2 take place in
the calvin cycle alone
Photorespiration occurs when rubisco react RuBP with
In the process of carbon fixation, RuBP attaches a CO2 to produce a six-carbon molecule, which is then split to produce two molecules of 3-phosphogly
regeneration of RuBP
Which of the following statements be represents the relationships between the light reactions and the calvin cycle?
The light reactions provide ATP and NADPH to the calvin cycle, and the cycle returns ADP, Pi and NADP+ to the light reactions
Why are C4 plants able to photosynthesize with no apparent photorespiration?
They use PEP carboxylase to initially fix CO2
A spaceship designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen
a mixture of blue and red light
If atmospheric CO2 concentrations increase twofold or more, how will plants be affected, disregarding any changes in climate?
Plant growth will not be affected because atmospheric CO2 concentrations are never limiting for plant growth
Plants photosynthesize only in the light. Plants respire
both in light and dark
A gardener is concerned that her greenhouse is getting too hot from too much light, and seeks to shade her plants with colored translucent plastic
Theodor Engelmeann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wave
bacteria congregated in these areas because these areas had the most oxygen being released
If cells in the process of dividing are subjected to colchicine, a drug that interferes with the formation of the spindle apparatus, at which stage
If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis?
For a newly evolving protist, what would be the advantage of using eukaryote-like cell division rather than binary fission?
cell division would allow for the orderly and efficient segregation of multiple linear chromosomes
Why do chromosomes coil during mitosis?
to allow the chromosomes to move without becoming entangled and breaking
In which group of eukaryotic organisms does the nuclear envelope remain intact during mitosis?
dinoflagellates and diatoms only
What is a cleavage furrow?
a groove in the plasma membrane between daughter nuclei
Density-dependent inhibition is explained by which of the following?
As cells become more numerous, the cell surface proteins of one cell contact the adjoining cells and they stop dividing
After which checkpoint is the cell first committed to continue to the cell cycle through M?
Why do neurons and some other specialized cells divide infrequently?
They have been shunted into G0
Which of the following is true concerning cancer cells?
When they stop dividing, they do so at random points in the cell cycle; they are not subject to cell cycle controls; and they do not exhibit density-dependent inhibition when growing in culture.
Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate.
a plant cell in the process of cytokinesis
In the cells of some organisms, mitosis occurs without cytokinesis. This will result in
cells with more than one nucleus
Which of the following does not occur during mitosis?
replication of DNA
If a horticulturalist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of the following would
clone the plant asexually to produce an identical one
In the human species, all somatic cells have 46 chromosomes. Which of the following can also be true?
A plant species (privet shrubs) has 46 chromosomes per cells
Which of the following defines a genome
the complete set of an organism's genes
Which of the following is true of a species that has a chromosome number of 2n = 16
Each cell has eight homologous pairs
Which of these statements is false?
At sexual maturity, ovaries and testes produce diploid gametes by meiosis
Which of the following is an example of alternation of generations?
A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte).
A given organism has 46 chromosomes in it karyotype. We can therefore conclude which of the following?
Its gametes must have 23 chromosomes
Which of the following best describes a karyotype?
a display of each of the chromosomes of a single cell
If a cell has completed the first meiotic division and is just beginning meiosis II, which of the following is an appropriate description of its contents?
It has half the amount of DNA as the cell that began meiosis
After telophase I of meiosis, the chromosomal makeup of each daughter cell is
haploid, and the chromosomes are each composed of two chromatids
A cell divides to produce two daughter cells that are genetically different
The statement is true for meiosis I only
Chromatids are separated from each other
This statement is true for mitosis and meiosis II
Which of the following occurs in meiosis but not in mitosis
synapsis of chromosomes
When we chiasmata under a microscope, that lets us know which of the following has occurred?
For a species with a haploid number of 23 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes?
about 8 million
Independent assortment of chromosomes is a result of
the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I
Which of the life cycles is typical for animals?
Which of the life cycles is typical for plants and some algae?
What do we mean when we use the terms monohybrid cross and dihybrid cross?
a dihybrid cross involves organisms that are heterozygous for two characteristics and a monohybrid cross involves only on
Why did the F1 offspring of Mendel's classic pea cross always look like one of the two parental varieties?
One phenotype was completely dominant over another.
What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?
Traits are inherited in discrete unites, and are not the results of "blending"
Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. What does this suggest?
that the parents were both heterozygous for a single trait
A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail (T). Its genotype is HhTt. Which of the following
When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the
Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following:
anaphase I of meiosis
Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the progeny of crosses will be
In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the
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