Which of the following particles are retained by clay soil and exchanged for hydrogen ions when plants take them up?
A. calcium & potassium
B. calcium & copper
C. iron & boron
D. calcium & ammonium
E. sodium & sulphur
Answer: A
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Which of the following may provide clues to the
evolution of sexual reproduction? a. similarities between mitosis and meiosis at the cellular level b. similarities between mitosis and meiosis at the molecular level c. gene products common to mitosis and meiosis that repair DNA d. gene products produced by an asexually reproducing species that are identical to those that serve in meiosis e. all of these
Progeria is a genetic disorder that causes numerous symptoms that resemble premature aging in patients. Progeria is caused by a dominant allele, and it always results in fatality before sexual maturity. Which of the following statements must be true about progeria?
What will be an ideal response?
Fossil evidence shows that giraffes living 1000 years ago had much shorter necks than the giraffes seen today. Which
statement best explains this observation? a. The two groups of giraffes are not related. b. The two groups of giraffes arose as a result of convergent evolution. c. The difference in neck length is evidence for homoplastic inheritance. d. The two groups of giraffes were located in different geographical locations. e. The giraffes acquired longer necks through the continuing process of natural selection.
Describe the tuberculin response and identify the type of response involved.
What will be an ideal response?