Which term refers to cell change and damage that occurs during the viral replication cycle?
a. cytopathic effects
b. viral envelopment
c. attenuation
d. lysis
a. cytopathic effects
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Stem cells that can differentiate into any type of tissue but cannot differentiate into a complete organism are ______________ cells
A. totipotent B. pluripotent C. unipotent D. None of the choices is correct.
Most genes have many more than two alleles. However, which of the following is also true?
A) At least one allele for a gene always produces a dominant phenotype. B) Most of the alleles will never be found in a live-born organism. C) All of the alleles but one will produce harmful effects if homozygous. D) There may still be only two phenotypes for the trait. E) More than two alleles in a genotype is lethal.
You label cells with a radioactive isotope of sulfur (35S). The only molecules that would be radioactively labeled in these cells are
A. proteins B. nucleic acids C. lipids D. carbohydrates
A polypeptide in a wild type microbe contains the sequence Leu-Pro-Tyr-Ser-Pro. A phenotypic variant of the species has the peptide sequence Leu-Pro-Cys-Ser-Pro. This is an example of a(n) ________ mutation.
A. nonsense B. missense C. silent D. frameshift E. inversion