During viral reproduction, HBV form an immature core particle made up of which components?

A. Core protein
B. Reverse transcriptase
C. Plus-strand RNA pregenome
D. All of these make up the immature core particle.


Answer: D

Biology & Microbiology

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Avery, MacLeod, and McCarty (1944) demonstrated that DNA was the molecule of heredity by treating heat-killed Streptococcus pneumoniae S (smooth) strain with DNase, thereby preventing transfer of the "transforming substance" from the killed S strain to the live R (rough) strain when the two were mixed together and injected into mice. Another way that one could demonstrate transformation in

bacteria would be to extract DNA from A) an R strain and mix with cells of an S strain. B) both S and R strains and mix to allow recombination to take place. C) an ampicillin-sensitive strain and mix with cells of an ampicillin-resistant strain. D) an S strain and mix with cells of an R strain. E) none of the above

Biology & Microbiology

Contained in amino acids, proteins, nucleic acids, chlorophyll.  

  Choose the letter of the best match: A. nitrogen B. calcium C. potassium D. phosphorus E. magnesium

Biology & Microbiology

Atomic force microscopes use a scanning probe that maintains a fixed distance from the surface of the specimen. It is useful for specimens that

A. do not conduct electricity well. B. have extremely uneven surfaces. C. both do not conduct electricity well and have extremely uneven surfaces are correct. D. neither do not conduct electricity well nor have extremely uneven surfaces is correct.

Biology & Microbiology

Genetic diversity can result when alleles are transferred from one population into another. What is the transfer of alleles from one population to another called?

A) gene flow B) replication C) mutation D) evolution

Biology & Microbiology