Viruses infect every organism that has been investigated for their presence. However, viruses can only replicate in
A. very limited conditions, depending on their capsid type.
B. a very limited manner if they are a retrovirus.
C. a very limited manner depending on their envelope capability with the host's cell membrane or cell wall.
D. their lytic stage outside the host cell membrane.
E. a very limited number of the host's cells.
E. a very limited number of the host's cells.
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Genetic variations in DNA sequences in human populations, such as single nucleotide polymorphisms (SNPs), have been used to map "disease genes" by determining whether the SNP is linked to the mutant gene
A. true B. false
In which structure do cilia covered in mucus trap foreign particles?
a. urinary tract b. reproductive tract c. arteries d. respiratory tract e. digestive tract
During which cell cycle phase(s) are chromosomes composed of two DNA molecules?
A) G2 B) G1 C) anaphase D) Answers (A) and (B) are correct. E) Answers (A), (B), and (C) are correct.
When considering DNA and RNA, which of the following statements is generally FALSE?
a. There are five major types of nitrogenous base. b. There are two types of purines and three types of pyrimidines. c. There are two types of purines and two types of pyrimidines. d. A free 3' hydroxyl group is found in deoxyribose. e. A free 3' hydroxyl group is found in ribose.