While viewing a slide of rapidly moving sperm cells, a student concludes that these cells require a large amount of energy to maintain their activity. What organelles provide this needed energy?

Which of the following cycles does not include the atmosphere as part of the cycle?

If an atom has a mass number of 23, which of the following is always true? A. The number of protons in the nucleus does not equal the number of neutrons. B. The Atom is not an isotope C. The atom has an odd number D.

16. The lateral-line of a shark is used for A. Detecting and locating objects and moving animals in the water B. Excretion of urea and water C. Detecting odors D. Secreting mucus as a swimming lubricant

Which of the following best describes how mRNA is produced? A. RNA provides a template for rna polymerase. B. Rna polymerase provides a template for dna

Which is the most likely cause of the observed variation? differences in the climate among the islands competition among individuals for available food sources competition among individuals for desirable mates differences in egg size among the

The range of all electromagnetic radiation is known as the HR diagram electromagnetic spectrum Sources of Light Chart radio wave graph

How is circular DNA compacted within the nucleoid of a cell? histone coiling heterochromatin supercoiling methylation What is the term for two circular DNA molecules that differ only in the number of helical turns, also called linking number?

How can so much information be transmitted by DNA if it is a sequence of only four letters

Pythons are generalist predators, consuming a wide variety of prey including birds, mammals ranging from rodents to deer, and alligators.

Do animals secrete hormones to break down food