A DNA sample is normally said to have a low copy number when it contains fewer than ________ DNA-bearing cells.

When words have been crossed out, document examiners frequently uncover the original writing with the aid of what?

What is indicated by the larger opening of a crater-shaped hole in glass made by the penetration of a projectile?

A conventional STR profile emanating from a mixture of DNA from male donors yields four peaks or bands for each locus present. How many peaks or bands would you normally expect for each locus if a Y-STR profile is performed on the same sample?

What fiber’s microscopic appearance includes a ribbon like shape (i.e., flat) with twists at irregular intervals?

What part of a hair contains its scales?

Which plant fiber is the most prevalent by far?

Overwriting, or crossing out, a writing is known as what?

Stress marks on the edge of a radial crack near the point of impact are:

Which of the following is made of natural polymers?