Anatomy and Physiology
Over what type of blood vessels does blood experience the greatest drop in pressure?
Arterioles
What are the main challenges in detecting Earth-like exoplanets?
Challenges include their small size, faint signals, and the need to distinguish them from stellar noise, as well as the difficulty of observing their atmospheres directly.
What type is the following reaction?
Na2CO3 (s) ---> Na2O (s) + CO2 (s)
Decomposition Reaction
Which portion of the electromagnetic spectrum is most commonly used for Earth observation?
Visible and infrared wavelengths
Why is mitochondrial DNA generally maternally inherited?
Mitochondria is generally maternally inherited as most of the paternal mitochondria do not make it in the egg, while the egg has thousands of mitochondria which outcompete the paternal mitochondria
An 80 year old man was admitted to the intensive care unit after going into cardiac arrest when alone at home. He underwent cardiopulmonary resuscitation and return of circulation was achieved. Three days later, he remains intubated and on full ventilator support. The patient is unresponsive to verbal and tactile stimuli. His vital signs are within normal limits. The treating physician discusses the possibility of brain death. What is most consistent with the criteria for brain death.
Irreversible absence of cerebral and brain stem reflexes
What causes T Tauri stars to exhibit variability?
Variability arises from unsteady accretion, magnetic activity, and surface spots on the star.
Which of the following statements about the acid dissociation constant (Ka) is correct?
The Ka value changes with temperature but remains constant for a given acid at a specific temperature.
A satellite is considered sun-synchronous if it:
Passes over locations at the same local solar time
What phenomenon describes when organisms of the same genotype do not express the same symptoms?
Incomplete penetrance is the phenomenon where a population with a certain genotype do not all express the same symptoms.
There are four main gases that make up the composition in the air in both the atmosphere and the alveoli. Rank the relative concentration of these gases.
nitrogen > oxygen > water vapor > carbon dioxide
What processes lead to the formation of Herbig-Haro objects?
Herbig-Haro objects form when collimated jets from young stars interact with surrounding gas, causing shock waves and emission at specific wavelengths.
What is the mass (in g) of CO2 gas produced by reacting 40.00 g of C3H8 with excess gas according to the following balanced chemical equation? (The molar mass of C3H8 is 44.10 g/mol, and the molar mass of CO2 is 44.01 g/mol).
C3H8 (g) + 5O2 (g) ---> 3CO2 (g)+ 4H2O (l)
119.8 g
Pushbroom scanners differ from whiskbroom scanners in that pushbroom scanners:
Use linear detector arrays
Hemoglobin and myoglobin are both present in humans, coded by separate genes. However these genes originated from duplicates of the same gene. What is the relationship between hemoglobin and myoglobin?
Paralogs
A 46-year-old woman undergoes a total abdominal hysterectomy with bilateral oophorectomy for severe endometriosis. Six months later, she presents to her physician with complaints of back pain. Imaging reveals decreased bone density consistent with osteoporosis. What best explains the underlying cause of this patient's current condition?
Increased osteoclastic bone resorption
What role do H I regions play in the evolution of galaxies?
H I regions serve as reservoirs of neutral hydrogen, providing raw material for star formation and contributing to the structure and dynamics of galaxies.
In which direction will the following reaction proceed if the initial concentrations are [PCl5] = 1.2 M, [PCl3] = 0.80 M, and [Cl2] = 0.60 M, given that the equilibrium constant Keq for the reaction is 0.40?
PCl (g)↔[ (g)+ (g) 5
No shift, the system will remain at those concentrations in equilibrium.
Distinguish between Spatial Resolution and Temporal Resolution.
Spatial: Size of the smallest detectable object (pixel size).
Temporal: How often the sensor records data for the same location.
Explain why recombination frequencies are unable to surpass 50 percent?
Because, if genes are completely unlinked, there is an exactly 50 percent chance that each allele is combined with a new allele. Independent assortment has a 50 percent recombination frequency
A 75-year-old man presents to his family medicine physician regarding rash on his left leg. On examination, you note an erythematous tender rash with poorly defined borders that spans the length of his lower leg. At the center of the rash you notice two small punctures, where he reports an insect bit him a few days ago. Vital signs are normal. What is the preferred treatment for this condition?
Antibiotic course
How do hot Jupiter's challenge traditional models of planet formation?
Their close proximity to their host stars implies significant migration after formation, contradicting earlier models that placed gas giants only in outer disk regions.
Consider the equilibrium reaction: 2AB⇌A2+B2
Initially, 2.50 M of AB gas is placed in a sealed reaction vessel. At equilibrium, the concentration of A gas is found to be 0.600 M. Determine the equilibrium concentration of AB gas.
2
1.30 M
Define Radiative Forcing. Is a positive RF associated with warming or cooling?
RF is the change in energy flux in the atmosphere (W/m2). Positive RF = Warming.
Explain how prokaryotes and eukaryotes are able to determine which strand is the template or new strand during mismatch repair after replication.
Prokaryotes are able to sense the methylation of the strand, the older strand is more methylated than the newer strand. Eukaryotes are able to sense the number of nicks which are present in higher quantities on the newer strand