Which of the following functions does active transport perform in a cell?
A. packaging proteins for export from the cell
B. distributing enzymes throughout the cytoplasm
C. moving substances against a concentration gradient
D. equalizing the concentration of water inside and outside the cell
C. moving substances against a concentration gradient
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Which of the following physical structures would a lake possess?
A) photic layer B) canopy C) herb layer D) keystone species
What is the reason that closely linked genes are typically inherited together?
A) They are located close together on the same chromosome. B) The number of genes in a cell is greater than the number of chromosomes. C) Alleles are paired together during meiosis. D) Genes align that way during metaphase I of meiosis.
In a typical mammalian cell, the concentration of _______ is higher on the inside, and the concentration of _______ is higher on the outside.
a. Na+ and Cl-; K+ b. Na+; K+ and Cl- c. K+; Na+ and Cl- d. K+ and Cl-; Na+
In many dense forests, plants living near the ground level engage in intense competition for
A) oxygen. B) water. C) carbon dioxide. D) sunlight.