An unknown sample known to contain either triglycerides or phospholipids is placed in water. The sample forms a separate layer on top of the water, with no mixing in the bulk volume of water. What type of lipid does the sample contain, and what structural element is responsible for the sample’s behavior in water? a. Triglycerides, double bonds in fatty acid tails b. Triglycerides, ester linkages c. Triglycerides, long-chain hydrocarbon tails d. Phospholipids, ester linkages e. Phospholipids, glycerol backbone

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

19. a cell is viewed under a microscope and is found to have two nuclear envelopes and spindles that appear to be breaking apart. which phase of mitosis is the cell most likely in? a. metaphase b. prophase c. telophase d. anaphase