The transport of two molecules across the cell membrane in different directions by one transporter is called ________
Fill in the blank with correct word.
Answer: antiport
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Based on the phylogenetic tree shown, which of the following is a correct statement of evolutionary relationships?
A. A snake is equally related to a bird and a crocodile. B. A snake is more closely related to a crocodile than to a turtle. C. A snake is more closely related to a crocodile than to a bird. D. A snake is more closely related to a bird than to a crocodile. E. A snake is more closely related to a frog than to a human.
Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water. When salt dissolves in water, individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules. Why would this cause ice to melt?
A. Hydrogen bonds are broken, and the salt ions interfere with interactions between H and O. As a result, it is more difficult for water molecules to bond and form ice. B. Hydrogen bonds are formed, and the salt ions bond with O. As a result, it is more difficulty for water molecules to bond and form ice. C. Hydrogen bonds are broken, and the salt ions bond with O and H respectively. As a result, it is more difficult for water molecules to bond and form ice.
The interaction of sympathetic and parasympathetic systems is best described as _____
a. antagonistic b. cooperative c. overriding d. synergistic e. ineffective
Cytoplasmic dynein plays a key role in the positioning of which organelle?
a. Nucleus b. Golgi apparatus c. Lysosome d. Mitochondrion e. Peroxisome