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1. One condition that seems to lead to senescence and not apoptosis in stem cells is:
a. shortening of telomeres below a critical limit b. base damage to DNA c. unequal division of chromosomes at anaphase d. none of the above 2. Knowing that even in the oldest people's stem cells seem to have many cell divisions left to them when cultured in vitro (in a dish), the you might contend that a possible reason for that was: a. Absence of inhibitory factors found in the old bodies in the new culture medium b. factors in the cellular environment of old people's bodiesc. The presence of high levels of growth factors in the culture serum d. All of the above 3. In 1962, Leonard Hayflick conducted an experiment that supported Weismann's Theory of programmed death. He proposed The Hayflick Limit which can be reached faster by:
a. Increasing the rate of cell division b. Underfeeding cells c. Decreasing the rate of mutations d. Synthetically elongating telomeres. 4. The antagonistic pleiotropy theory of aging assumes that each gene has only one effect on the phenotype of an organism at different stages of its life. True or False 5. In Conboy's study on heterochronic parabiotic pairs, which phrase described what future studies should focus on according to the results of this study?
a. adult stem cells b. changes in aging cells c. muscle cell regeneration d. changes in aging plasma
What is the most likely fate of genes that have undergone a duplication? How can natural selection maintain 2 or more copies of duplicate genes in populations?
A very heavy rainstorm floods a mountain river, changing its course and digging a deep canyon through the soft soils of the meadow in the valley below. What happens to the mice on either side of the valley?
The stimulus for secretion of neurotransmitters into the synaptic cleft is an increase in?
In corn plants, a dominant allele I inhibits kernel color, while the recessive allele i permits color when homozygous. A second dominant allele P produces purple kernel color, while the homozygous recessive genotype pp causes red kernels.
q1. a scientist wants to grow human cells to use in an experiment. what must the scientist do to grow and maintain
What is the phenotypic ratio you would expect to see in the F2 generation if you were following a sex-linked trait? An autosomal trait? Two autosomal dominant characters (dihybrid cross).
Calculate the intrinsic fluorescence lifetime τ0 from the following decay curve if the quantum yield is 0.5.
Issues of diversity: For example, is there heterosexism present in the article? Do they assume the person reading the article is sexually active with a member of the other sex?
All of the intermediates in the glycolytic pathway are phosphorylated. Give three plausible reasons why this might be advantageous to the cell.
Your friend has isolated plasma membranes and reassembled the membranes into small vesicles. Using fluorescently labeled lectin, he sees that some of his vesicles are labeled while others are not.
Create a cohesive paragraph about proteins explaining their chemical content, structure, and general properties. In discussion, describe the general chemical structure of an amino acid.
A 41 year old homeless man with a history of alcohol abuse was brought to the ER by his friend. The patient had a productive cough which produced a-foul-smelling, purulent sputum. He had a fever and poor dental hygiene. Chest x-ray showed infiltra..
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