Tutor profile: Elana L.
Llena el espacio con la conjugación correcta: "Cuando yo ______ (tener) 5 años siempre ______ (jugar) al fútbol con mis hermanos."
Cuando yo TENÍA 5 años siempre JUGABA al fútbol con mis hermanos. This questions requires you to decide between imperfect and preterite verb conjugation.
Which of the following amino acid R group categories are correctly matched to a proper description? A. Basic R group - negatively charged at physiological pH. B. Basic R group - neutral at physiological pH. C. Acidic R group - neutral at physiological pH. D. Acidic R group - negatively charged at physiological pH.
The correct answer is D: an acidic R group will be negatively charged at physiological pH. This question requires knowledge of the physiological pH value (7.4) and how an acidic or basic R group would behave in this environment. Acids tend to lose a proton (H+) when in contact with an environment that is more basic relative to the acid. Thus, a negatively charged R group remains once the proton has dissociated. Conversely, bases tend to gain or accept a proton (H+) in environments that are more acidic relative to the base. Thus, a positively charged R group results upon accepting a proton.
What are the main types of memory, and how do they differ?
The most ephemeral form of memory is sensory memory, which typically lasts for less than 1 second. Sensory memory describes the brief impression of a sensory stimulus that remains just after that stimulus has ended. There are two types of sensory memory: echoic (auditory stimuli), and iconic (visual stimuli). Short-term memory is the next briefest form of memory, which lasts up to 30 seconds. This form of memory temporarily stores information. Commonly discussed is the "7 plus or minus 2 rule," which states that our short-term memory is limited in capacity, and can only hold approximately 7 items at one time. Working memory is similar to short-term memory; however, it differs in that it allows for the manipulation of information in short-term memory, instead of just their storage. Finally, long-term memory refers to the form of memory that stores information for a longer period of time. This can range from greater than 30 seconds to years.
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