Painful, blister-like lesions that progressively become filled with pus suggest infection with a (herpesvirus/poxvirus/papillomavirus).
Fill in the blank(s) with the appropriate word(s).
poxvirus
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A stroke may occur when
a. a vessel in the brain ruptures. b. a vessel in the heart ruptures. c. a vessel in the brain is blocked by a clot. d. a vessel in the heart is blocked by a clot. e. a vessel in the heart ruptures, and a vessel in the brain is blocked by a clot
What allows each strand of DNA to serve as a template for a new DNA strand during replication?
a. covalent bonding between nucleotide bases b. hydrogen bonds between the deoxyribose and the phosphate groups c. complementary base pairing between purines and purines on opposite strands d. complementary base pairing between pyrimidines and pyrimidines on opposite strands e. complementary base pairing between purines and pyrimidines on opposite strands
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 semiconservative model of DNA replication is correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?
A. One band of intermediate density and one band of heavy density. B. One band of intermediate density and one band of light density. C. One band of intermediate density. D. One band of heavy density and one band of light density. E. One band of heavy density.
Which class of RNA carries protein-building codes from DNA?
A) mRNA B) tRNA C) rRNA D) all of the choices