By which of the following mechanisms can a cell transport a substance from a lower to a higher concentration?
A) simple diffusion
B) facilitated diffusion
C) active transport
D) extracellular enzymes
E) aquaporins
C
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Oviparous animals ____
a. lay eggs that contain the nutrients needed for development of the embryo outside the mother’s body b. retain the embryo within the mother’s body and nourish it at least through early embryo development c. have a specialized temporary structure, the placenta, which connects the embryo to the uterus during development d. retain fertilized eggs within the body, where the embryo develops using the nutrients provided by the egg e. have mature egg-producing and mature sperm-producing tissue present in the same individual
In the Hershey and Chase experiment, 32P was used to label ____ and 35S was used to label ____
a. RNA; protein b. protein; DNA c. phospholipids; protein d. protein; phospholipids e. DNA; protein
The term substrate is synonymous to the term ____
a. enzyme b. end product c. reactant d. intermediate e. active site
B cells are activated when they interact with (antigen-presenting/Th1/Th2 ) cells
What will be an ideal response?