Diseases such as scrapie in sheep, "mad cow" disease in cattle, and Creutzfeldt-Jakob disease in humans are known as
A. viroids.
B. viruses.
C. retroviruses.
D. TSEs (transmissible spongiform encephalopathies).
E. emerging viruses, for example Ebola.
D. TSEs (transmissible spongiform encephalopathies).
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Most often, genomic library screening uses ____
a. a labeled, complementary single-stranded RNA or DNA molecule called a probe b. colonies of vector bacteria on a Petri dish in order to replicate the desired genome c. recombinant plasmids containing DNA and DNA ligase d. cut plasmids containing recognition sites used to carry DNA molecules e. tRNA polymerase copies with a truncated copy of a DNA template
An alteration occurs during the formation of a dikaryotic cell, such that it has twice the number of nuclei compared to a normal dikaryotic cell. Only the number of nuclei changes; the type of nuclei remains the same. This altered cell is most accurately described as having
A. two haploid nuclei. B. two diploid nuclei. C. four diploid nuclei D. has four haploid nuclei. E. two haploid nuclei and two diploid nuclei.
Found in secretions such as breast milk and saliva.
What will be an ideal response?
Before Darwin could conceive of the idea of "descent with modification," he first had to accept
A. that organisms could inherit acquired characteristics. B. the idea of catastrophism. C. that the size of human populations is limited only by the quantity of resources. D. the earth was very old.