Mendel performed numerous controlled genetic crosses to obtain strains that consistently produced a single phenotype without variation. What are these strains that consistently produce the same phenotype called?
What will be an ideal response?
pure-breeding or true-breeding strains
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Why does the presence of telomeres protect the ends of linear chromosomes?
A. Telomere DNA is resistant to nuclease activity. B. The telomeres represent large "buffer zones" of DNA sequence that do not code for biomolecules. Loss of these sequences is easily tolerated. C. Every time somatic cells replicate, telomerase extends the ends of the chromosomes. D. Specialized telomere-binding proteins prevent loss of DNA during replication. E. None of these choices is correct.
The image shown above is an example of a(n) ____
a. random coil b. leucine zipper c. ? sheet d. ? helix e. ? polysaccharide
Molluscum contagiosum is transmitted by direct contact with skin lesions, fomites, and sexual activity.
Answer the following statement true (T) or false (F)
With the exception of gametes, a human cell contains _________ chromosomes.
A. 23 B. 46 C. 47 D. 2n