Most cellular lipids are synthesized in
a. fat droplets.
b. mitochondria.
c. the endoplasmic reticulum.
d. the Golgi apparatus.
Ans: c. the endoplasmic reticulum.
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You decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the E. coli cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the conservative model of DNA replication was correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?
A. One band of intermediate density. B. One band of light density. C. One band of heavy density. D. One band of light density and one band of heavy density. E. One band of light density and one band of intermediate density. 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?
In a group of 100,000 people, about how many would be expected to have the same genotype as the crime scene sample? For simplicity, assume all SSR alleles are present in the population at a frequency of 0.2.
A) 0.000256 B) 6 C) 13 D) 51 E) None of the choices is correct.
Which of the following senses involves molecules binding to a receptor surface?
A. sight B. hearing C. touch D. smell
Which type of vesicle/vacuole is incorrectly matched with its description?
A) Secretory vesicle: Replenishes the lipid bilayer and deliver proteins for incorporation into the membrane B) Vacuole: Contains water and substances such as nutrients, toxins, or waste products C) Peroxisome: Protects the cell from hydrogen peroxide and other toxic oxygen intermediates D) Transport vesicle: Moves substances to diverse cellular destinations within the cell E) Lysosome: Contains hydrolytic enzymes that break down substances engulfed by the cell