What do you know about water as a solvent?
What will be an ideal response?
Water is a polar molecule, this means that other polar molecules or ions will dissolve in it. These
water loving molecules are called hydrophilic.
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Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?
A) Enzymatic activity was proportional to the amount of calcium added to a cell-free extract. B) Receptor studies indicated that epinephrine was a ligand. C) Glycogen breakdown was observed only when epinephrine was administered to intact cells. D) Glycogen breakdown was observed when epinephrine and glycogen phosphorylase were combined. E) Epinephrine was known to have different effects on different types of cells.
Organisms that are prokaryotes are in the domains
A) Plantae and Animalia. B) Eukarya and Archaea. C) Archaea and Plantae. D) Fungi and Bacteria. E) Bacteria and Archaea.
The ends of chromosomes are called ________.
A. telomeres B. centromeres C. caps D. DNA termini
Which of the following is not the correct combination of plant tissue and function in a leaf?
A. epidermis: covering of leaf surface B. mesophyll: photosynthetic cells C. veins: vascular tissue D. epidermis: protection E. mesophyll: leaf surface