4. A sample of DNA from a human skin cell contains

32% cytosine (C) bases. Approximately what

percentage of the bases in this sample will be thymine

(T) ?

A) 18 B) 24 C) 32 D) 36

O MET

When two ions come together with the same charge come together, thier electric fields will ...

Which statement best illustrates how an organism maintains homeostasis? A) Female barn swallows mate with long-tailed males. B) Desert pack rats are active at night to conserve water. C) Parents pass their traits to their offspring.

Which three body systems work together to obtain and distribute oxygen and nutrients?

Think back to the bean plant experiment you read about earlier. The student's hypothesis stated, "If bean plants are grown in green light, they will grow taller, because bean plants are green.

17. Filch knew Harry was in the library when a) Harry sneezed b) Mrs. Norris started licking him c) Harry opened a book that screamed d) he saw Harry's lamp

What is the difference between adult stem cells and embryonic stem cells

What is the main function of the large intestine? A. digestion of proteins B. absorption of nutrients C. breaking down complex carbohydrates D. removing water from undigested waste

Which type of environmental scientist is most likely to study how whales are affected by pollution? a. Hydrologist b. Toxicologist c. Ecologist d. Oceanographer

How did Francesco Redi disprove the idea of spontaneous generation? He showed that flies were not produced by meat. He showed that microorganisms are present in air. He showed that microorganisms cause disease. He showed that flies spread disease.

Of the millions of sperm who start the long journey to the egg, how many sperm are actually allowed to enter the egg?