ISO membranes are inside-out membrane vesicles used by researchers in membrane studies. As a molecule diffuses into the vesicle, it will encounter the layers of the membrane in the following order
A) tail-head-head-tail.
B) head-tail-head-tail.
C) tail-head-tail-head.
D) head-tail-tail-head.
E) head-head-tail-tail.
D
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You take a sample of bacteria with DNA that contains only 14N and allow them to replicate in a medium that contains only 15N. After 3 rounds of replication, what percent of the DNA molecules will contain one strand with only 14N and one strand with only 15N? Enter your answer as a whole number without the percent sign. For example, 5% would be entered as 5 and 37% would be entered as 37.
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about the Meselson-Stahl experiment? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Match the following items with the correct phrases.
_______1. In ____________________, bacteria acquire new genetic information in the form of viral genes. _______2. Oswald Avery and his colleagues discovered that DNA is the hereditary molecule while performing ____________________ experiments with Streptococcus pneumoniae. _______3. In ____________________, bacteria acquire new genetic information as a result of absorbing pieces of naked DNA from their environment. _______4. In ____________________, genetic information is passed from one bacterial cell to another via a hollow sex pilus. _______5. In ____________________, bacteria acquire new genetic information when bacteriophages inject bacterial genes. a. conjugation b. lysogenic conversion c. mutation d. transduction e. transformation
Self-recognition is based on T cell receptors recognizing:
a. MHC markers b. perforins c. complement d. naive B cells e. antibodies
The ability of a lens to gather light is referred to as its
A) resolution. B) numerical aperture. C) refraction. D) contrast. E) magnification.