Which of the following is NOT an example of how differential gene regulation affects cellular response?
A. The expression of proteins that are controlled by signal transduction pathways may vary in different cell types.
B. Cell junctions passing ions between the cytosol of one cell to another cell.
C. A cell may or may not express a receptor for a particular signaling molecule.
D. The expression of proteins involved in intracellular signal transduction pathways may vary in different cell types
E. Different cell types have different cell surface receptors that recognize the same signaling molecules.
B. Cell junctions passing ions between the cytosol of one cell to another cell.
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The human genome is mostly composed of:
A. active retrotransposons. B. protein-coding genes. C. introns. D. transposons and retrotransposons that are mostly inactive. E. long repetitive sequences like centromeres and telomeres.
Population increase is most influenced by ____
a. percentage of humans in the pre-reproductive and reproductive age groups b. number of individuals in the post-reproductive age groups c. percentage of individuals in the reproductive age groups d. number of women in the reproductive age groups e. number of men in any age group
Floating leaves of aquatic plants have:a
stomata only on the lower epidermis. b. stomata only on the upper epidermis. c. stomata on both the lower and upper epidermis. d. no stomata on the epidermis. e. stomata only within the mesophyll.
Which of the following is a simple sugar?
A) sucrose B) starch C) pasta D) fructose E) lactose