All of the following pertain to platelets, except
A. they are not whole cells but are pieces of cells.
B. they originate from giant multinucleate cells called megakaryocytes.
C. they contain hemoglobin to transport oxygen and carbon dioxide.
D. they function primarily in hemostasis.
E. they function in blood clotting and inflammation.
Answer: C
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What characteristics make bacteria like E. coli attractive as model organisms?
A) short generation time, simple genome relative to to that of humans, easily mutagenized, haploid, gene control mechanisms identical to eukaryotes B) short generation time, simple genome relative to to that of humans, easily mutagenized, haploid C) short generation time, genome as complex as that of humans, easily mutagenized, haploid D) short generation time, simple genome relative to to that of humans, easily mutagenized, diploid
In the accompanying figure, the chance that individual IV-7 is a heterozygous carrier is __________
A) 1/4 B) 1/3 C) 1/2 D) 2/3 E) 3/4
Does ADP contain the capacity to provide energy for the cell?
A. No. ADP does not contain any bonds that can be broken to provide energy for the cell. B. Yes. ADP has the same capacity to provide energy for the cell as ATP. C. Yes. Cleaving the bond between the terminal phosphate and the phosphate attached to the ribose sugar can provide energy for the cell. D. Yes. Cleaving the bond between the ribose sugar and the two phosphate groups can provide energy for the cell.
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 light density and one band of intermediate density B. one band of intermediate density C. one band of heavy density D. one band of light density E. one band of light density and one band of heavy density