Why is PCR a necessary step in the analysis of a DNA sample taken from a crime scene A: the sample yields very little DNA B: the sample may be contaminated C: the sample undergoesdegradation D: the sample may not provide an accurate sequence

The sympathetic nervous system is

Characteristics of phospholipids include all of the following except A. are major components of cell membranes, blood fluids, and body fluids B. the body can make them C. are components found in plants D. are components found in animals products

Generally speaking, the maximum number of links in a food chain is 05 09 07 03

2. As water moves down through the soil, it is called: A. percolation B. permeability C. hydraulic conductivity D. all of the above

Galactose is a sugar and follows the ratio of 1:2:1. The chemical formula for galactose is C6H12O__. A. 1 B. 12 C. 6 D. 22

Which phrase describes the study of ecology? a. transfer of light energy to chemical energy b. organisms that reproduce and maintain structure c. comparing biotic and abiotic ecosystems d. how living things are interconnected with their environment

In an energy pyramid, the amount of energy at the producer level is 475,650 kilocalories. The pyramid has four trophic levels, including the producer level.

When the morning announcements call for you to rise to recite the pledge of allegiance, the signal to stand up on your feet is sent by way of which system?

Which statement is true about cell differentiation? A. It happens in all cells. B. It causes cells to change and specialize. C. It produces identical cells. D. It happens during cell division.

What two factors regulate cell division