Which of the following is not true of the earliest life on Earth?
1.It arose by chemical evolution.
2.It used RNA as its genetic material.
3.It used organic molecules that were produced naturally.
4.It was dependent on oxygen for metabolism.
4
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Which of the following is not a characteristic of meiotic cell division?
A. Cell division results in the production of gametes. B. Daughter cells are genetically identical. C. Cell division results in the formation of four daughter cells. D. Cell division requires two rounds of nuclear division.
Consider a diploid organism. What is the genotypic ratio expected to be observed in the offspring produced by two heterozygous parents?
a. 3 homozygous dominant : 1 homozygous recessive b. 2 homozygous dominant: 2 homozygous recessive c. 2 homozygous dominant: 1 heterozygous: 1 homozygous recessive d. 1 homozygous dominant: 2 heterozygous: 1 homozygous recessive
The expression of both alleles for a trait in a heterozygous individual illustrates
A) codominance. B) pleiotropy. C) polygenic inheritance.
How is antibody-mediated immunity different from cell-mediated immunity?
a. Antibody-mediated immunity requires lymphocytes; cell-mediated immunity does not. b. Antibody-mediated immunity is innate; cell-mediated immunity is adaptive. c. Antibody-mediated immunity is adaptive; cell-mediated immunity is innate. d. Antibody-mediated immunity requires both B and T cells; cell-mediated immunity requires T cells but not B cells. e. Antibody-mediated immunity requires T cells; cell-mediated immunity requires B cells.