Investigators learned that the same individual committed multiple murders because:

During PCR, which enzyme synthesizes new DNA strands?

DNA phenotyping uses autosomal DNA because autosomes:

Suppose investigators recovered DNA from two crime scenes with identical STR profiles. What is the MOST reasonable scientific conclusion?

Which of the following statements about sexually transmitted diseases (STDs) is true?

Veritas News is conducting a poll asking people if they support a property tax increase to fund improvements to the local schools. Which sampling method is most likely to produce a biased result? 

What is the ratio of the corresponding sides?  A geometric diagram shows two triangles stacked vertically. The upper triangle is labeled X, Y, and Z. Points Y and Z form a horizontal base, with Y on the left and Z on the right. Point X is centered above the base, forming the top vertex. Below it is a smaller triangle is labeled T, U, and V. Points U and V form a horizontal base, with U on the left and V on the right. Point T is centered above the base. Both triangles have a similar orientation, with a horizontal base and a single top vertex centered above the base.

Find the value of x if the perimeter is 39 m. A triangle is shown filled with a dark purple shading and appears symmetric. The left and right sides are both labeled 13x minus 21. The base runs horizontally along the bottom and is labeled 13x plus 3.

Which statement has the same meaning as the statement below? If Ryan is sick, then Becky takes the bus to school.

Point Q“ is the image of point Q after a composition of transformations: a reflection over line m, followed by a reflection over line n. If m and n intersect to form a 44 degree angle, what is the angle of rotation from Q to Q“ about the point of intersection?