If a DNA molecule is compared to a spiral staircase, what parts make up the steps?

sugar and nitrogen base

pairs of nitrogen bases

sugar and phosphate

pairs of sugars

Which type of respiration takes place when there is no oxygen present? O A. Aerobic O O O B. Mitochondrial c. Anaerobic D. Cellular

True or false? the driving force for the unloading of oxygen from hemoglobin into tissues is the difference in pco2 levels between the blood and body tissues.

How does the use of different restriction enzymes affect the size of the DNA bands produced?

What role do specialized cells perform in establishing homeostasis? Specialized cells work independently to perform their specific functions. Specialized cells work only as a team to perform the functions of the body.

Which result from an increase in the greenhouse effect

Organisms best suited to the environment will be the ones that survive and reproduce. This statement best describes A. Natural Selection B. Punctuated Equilibrium C. Adaptive Radiation D. Artificial Selection

External vs Internal environment

According to this food web, which of the following would be considered secondary consumers? Group of answer choices Plants Grasshoppers Wolves Mushrooms

Is a nucleic acid that contains the genetic information for heredity in most organisms. A. a chromosome B. genetics C. a gene D. heredity E. DNA

Joe, a hiker, stands at the top of a hill on a trail above the ocean. Joe's friend Dave is just starting out at the trailhead, which is at the beach. Which statements about Joe and Dave are accurate? Select three options.