Preliminary digestion of carbohydrates begins in the _____

Which of the following is a characteristic of octopuses and squid?

a. an open circulatory system b. a closed circulatory system c. the presence of mesohyl d. a single heart

Which of the following statements is correct regarding the human digestive tract?

a. The large intestine contains villi and is smaller in diameter and shorter in length than the small intestine. b. The large intestine contains villi and is smaller in diameter and longer in length than the small intestine. c. The large intestine does not contain villi and is smaller in diameter and longer in length than the small intestine. d. The large intestine does not contain villi and is larger in diameter and smaller in length than the small intestine. e. The large intestine does not contain villi and is larger in diameter and longer in length than the small intestine.

Which of the following is not a checkpoint in the cell cycle?

A. The G1/S transition D. Late metaphase B. The S/G2 transition E. The prophase/ metaphase transition C. The G2/M transition

A field biologist finds an unfamiliar single-celled organism in a sample from the surface of a marshy area. What observations or tests would make it possible to determine whether it is a protozoan, fungus, or alga? Assume the PCR machine at the field station is not working, but all other equipment is

What will be an ideal response?