Lloyd’s lab partner is looking down into a test tube while he heats the contents by using a flame. which action should lloyd recommend to his partner if heating must continue?
a) wear safety goggles while looking into the opening of the test tube.
b) cover the opening of the test tube so that no materials can boil out of it.
c) move the test tube so that the opening is pointing away from all students.
d) put the test tube in a hot water bath so that no water can enter its opening.

Which of these is not a function of some membrane proteins ? a. allowing polar molecules to enter the cell b. recognizing other types of cells c. receiving messeges from other cells b. carrying messages to oher cells

Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.

Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down