Pulmonary alveolus (plural form:alveoli) is an integral component of the mammalian respiratory system, which of the following characteristics describes this component? Note: There is a poll embedded within this post, please visit the site to participate in this post's poll. Correct Answer: D. B and C The correct answer is D. Alveoli are found in the parenchyma of the lungs at the terminal end of the respiratory tree. Alveoli in the lungs of mammals are the key structure in facilitating the exchange of CO2 and O2 across the alveolar membrane by pumping CO2 rich blood from the body into the oxy ..read more

[php snippet=3] A small cannonball weighing 5-kg is launched vertically in the air with an initial kinetic energy of 500 joules. How high will the cannonball travel above the launch point? Note: There is a poll embedded within this post, please visit the site to participate in this post's poll. Correct Answer: B. 10 m. All of the kinetic energy will be transferred into potential energy at the maximum height of the cannonball. The trick is to not replace KE with (1/2)mv2, the kinetic energy is already given! Therefore: KE -> PE -> KE = PE -> KE = mgh -> h = KE/mg = 500 J / (5 kg)(1 ..read more

[php snippet=3] When metallic substances lose electrons, they are trying to achieve the electron configuration of what? Note: There is a poll embedded within this post, please visit the site to participate in this post's poll. Correct Answer: D. The previous noble gas. A metal prefers to lose electrons so that it has the configuration of 8 around its valence shell so that it is equivalent to the stable noble gas previous to it. [php snippet=6] Subscribe below to receive the MCAT Question of the Day delivered straight to your inbox every morning.   ..read more

[php snippet=3] A blood cell is placed into a salt-water mixture (70% salt). What is likely to result if the red blood cell’s membrane is permeable to water? Note: There is a poll embedded within this post, please visit the site to participate in this post's poll. Correct Answer: B. The cell will shrivel For cells with a selectively permeable membrane, water will move from higher water concentrations to lower water concentrations. In this problem, the salt is too large to cross the membrane, so the salt concentration will remain the same. Since red blood cells have more water than the salt-wa ..read more

[php snippet=3] A force of 1 minion can cause 1 gram to accelerate at 1 cm/s2. How many newtons are equivalent to 1 minion? Note: There is a poll embedded within this post, please visit the site to participate in this post's poll. Correct Answer: A. 10-5 1 newton = 1 kg*m/s2 Therefore: 1 (g*cm)/s2 = x (kg*m)/s2 -> 1(10-3kg)(10-2m) = 10-5 Get it right? Tweet at us: Tweet Subscribe below to receive the MCAT Question of the Day delivered straight to your inbox every morning.   ..read more

[php snippet=3] The basic premise of cladistics is organisms that are closely related share a common evolutionary history. The characteristics that are shared by group members and derived from their ancestors are called: Note: There is a poll embedded within this post, please visit the site to participate in this post's poll. Correct Answer: B. Synapomorphies Plesiomorphies are characteristics that are original in the organism. While apomorhic means “derived characteristic”, the prefix syn- alters the meaning to “shared derived characteristic.” Using the prefix aut- causes the meaning to chan ..read more

[php snippet=3] Which of the following is considered the most effective laboratory sterilization technique? Note: There is a poll embedded within this post, please visit the site to participate in this post's poll. Correct Answer: D. Autoclave The autoclave is the laboratory proven method for killing bacteria, fungi, and some viruses. It can reach temperatures of 121 °C and 2.7 atm, and the combined pressure and temperature are enough to kill the majority of existing pathogens. However, the autoclave cannot kill some species that are able to form heavy spores or protein coats, which include s ..read more

[php snippet=3] Which of the following accurately describes the complement system? Note: There is a poll embedded within this post, please visit the site to participate in this post's poll. Correct Answer: C. Part of the innate immune system comprised of plasma proteins synthesized primarily by hepatocytes. The complement system is a clear example of innate immunity, being a form of host defense that is non-specific and does not adapt in response to antigens. However, there is evidence of cross-talk between the complement system and adaptive immunity. Similarly components of the complement sy ..read more

[php snippet=3] A racecar travels in a circular path around the Daytona 500 track. The radius of the circular track is doubled and the speed of the car does not change. The required force to maintain the car’s motion is: Note: There is a poll embedded within this post, please visit the site to participate in this post's poll. Correct Answer: D. halved. The centripetal force of the car is mv2/r, where m is the car’s mass, v is the velocity, and r is the radius of the circular track. If we double the radius while keeping everything else uniform, the centripetal force will be halved because they ..read more

A online data bedroom provides businesses in different market sectors with a protect way to talk about documents remotely. This makes the information easier to deal with and coordinate, allowing corporations to make faster, more enlightened decisions and close deals more quickly. Additionally , that reduces risk by eliminating mishandling of delicate documents and preventing leaks. Expenditure bankers regularly use https://newsoftwarezone.org/best-vpn-for-kodi a VDR to help in capital raising, IPO releases, and M&A processes that require large records. This allows with regards to increased ..read more