I graduated from university in 2018 with my Bachelors of Science in Biomedical Science. My program consisted of science courses from many different disciplines including biology, chemistry, anatomy, physiology, psychology, and physics. I believe this has provided me with a holistic education of the sciences. I have a year of experience as an educator at the collegiate level. I taught both Biology and Anatomy & Physiology to college students. Also, I have tutored students on Biology, Chemistry, and other subjects in the past.
Which energy-level changes can bedetected by the unaided eye?
Discuss how buffers help prevent drastic swings in pH.a. Buffers absorb excess hydrogen and hydroxide ions to prevent increases or decrease in pH. Anexample is the bicarbonate system in human body.b. Buffers absorb extra hydrogen ions to prevent increases or decreases in pH. An example is the bicarbonate system in the human body.c. Buffers absorb excess hydroxide ions to prevent increases or decreases in pH. An example of thatis the bicarbonate system in the human body.d. Buffers absorb excess hydrogen and hydroxide ions to prevent increases or decreases in humanexample of that is carbonate system in human body.
A pond is stocked with 250 fish, all of the same species. At that time, the researchers tested the fish to determine if they were genetically predisposed to a certain disease. The gene tested has two alleles, A and a. They found that 58 of the fish possessed allele A, while the rest of the fish possessed allele a. They plan to reassess the fish 5 years later. A computer model predicts that the population will likely increase to 850 fish and have 403 heterozygote (Aa) individuals. Will the future population have evolved? State how you know.a. Evolution has not occurred, because the frequency of the heterozygotes is different 5 years later compared with the original population.b. Evolution has not occurred, because the frequency of the heterozygotes is different 5 years later as in the original population.c. Evolution has not occurred, because the frequency of the heterozygotes is the same 5 years later as in the original population.d. Evolution has occurred, because the frequency of the heterozygotes is different 5 years later compared with the original population.
Arsenic poisoning disrupts ATP production by inhibiting several of the enzymes in the oxidativephosphorylation pathway. Some of the symptoms of arsenic poisoning are similar to cystic fibrosis (difficulty breathing and frequent lung infections). Explain what impact arsenic poisoning may have on components of the plasma membrane and transport that result in CF like symptoms.a. Arsenic poisoning disrupts ATP production, leading to decreased transport of $\mathrm{Cl}^{-}$ ions by epithelial cells. This leads to decreased electrolyte concentration in the mucus and retention of water into the cells. The mucus becomes dehydrated, as in CF.b. Arsenic poisoning disrupts the $\mathrm{Na}^{+} / \mathrm{Cl}^{-}$ pump, leading to decreased transport of $\mathrm{Cl}^{-}$ ions outside the epithelial cells. This increases the electrolyte concentration in the mucus and movement of water out of the cells. The mucus becomes hydrated as in CF.c. Arsenic poisoning affects the oxidative phosphorylation pathway, leading to decreased transport of $\mathrm{Na}^{+}$ ions outside the epithelial cells. This leads to increased electrolyte concentration in the mucus and movement of water into the cells. The mucus becomes dehydrated as in CF.d. Arsenic poisoning disrupts the binding sites for $\mathrm{Cl}^{-}$ ions, leading to decreased transport of $\mathrm{Cl}^{-}$ ions outside the epithelial cells. This leads to decreased electrolyte concentration in the mucus and movement of water outside the cells. The mucus becomes hydrated as in CF.
As a conservationist, you are preparing a report on a frog population living on a mountainside in Costa Rica. In your report, which potential threats to the survival of the species will you predict taking into account environmental abiotic conditions and human activities?
a. The frog is at risk from climate change, habitat destruction, and aggressive predators.b. The frog is at risk from climate change, exotic species, and possible habitat destruction.c. The frog is at risk from climate change, habitat destruction, and sparse availability of food.d. The frog is at risk from climate change, exotic species, and over-hunting in its habitat.
Explain benzene’s structure and how it makes the molecule unusually stable.
A 40.0 g steel marble is fired to the left towards a window at a speed of 65.0 m/s. The image below represents the force exerted on the marble during the collision with the window. After the collision, what is the velocity of the marble?
This exercise uses the population growth model.
A certain species of bird was introduced in a certain county 25 years ago. Biologists observe that the population doubles every 10 years, and now the population is 22,000.(a) What was the initial size of the bird population? (Round your answer to the nearest whole number.)
When rolling a six sided die, of which all sides are equally likely, it can be shown that the probability of rolling a multiple of 3 is:
