Why do we need to stain DNA after gel electrophoresis? 

You find yourself in a scenario similar to the movie “Mamma Mia.”   One of your old friends has just had fraternal twins – a boy and a girl.  She wants to receive child support from her babies’ father but she doesn’t know who he is.  Luckily, you, her trusted friend, work in a molecular biology lab. She has come to you for help, so you perform DNA fingerprinting on samples of blood from the mother (M), the two babies (B1,B2), and three men (a,b,c) that the woman had one-night stands with nine months ago.  Who should she ask for money? Choose a, b, c or a combination of two, and explain your answer.

Label this PCR diagram: Words to use: denaturation, extension, annealing, pre-incubation, final extension.  Which letters represent one cycle? A: B: C: D: E: One cycle is:

An organism has the following features:  prokaryotic; phospholipids with ester linkages in plasma membranes, pathogenic to humans.  What other feature would this organism have?

A geneticist is studying sexual reproduction of a species of butterfly that lives in a very cold climate.  He hypothesizes that there should be low genetic diversity because it is well adapted to the cold climate but does not seem to be able to colonize surrounding areas with warmer climates.  What important principle is he using to formulate his hypothesis?

All animals must get oxygen to tissues for cellular respiration.  Which of the following is NOT involved in this critical function?

A species of beetle is active at night and sleeps in the bark of trees during the day.  These beetles normally mate during the night on the sides of trees.  The forest they live in has lizards that hunt insects by vision and birds that hunt insects by sounds made by their prey.  Which of the following represents the most adaptive way for male and female beetles to find each other for mating?

According to the phylogenetic tree below, modern-day mammals are most closely related to which modern group of reptiles?

The organ system that contains smooth muscle, epithelium, and endocrine cells, and involves organs such as the pancreas, liver, and pharynx, is the

On this temperature versus precipitation graph, the four areas plotted represent the ranges of temperatures and precipitations typical of four major types of biomes. Which choice correctly identifies the temperature and precipitation profiles for each type of biome?