If a normal cell contains 36 chromosomes, how many chromatids are present during alignment? How many strands of DNA? How many genetically unique strands of DNA?
What will be an ideal response?
72 chromatids; 72 strands of DNA; 36 strands of genetically unique DNA (because each original strand of DNA was replicated, thus these two strands are genetically identical)
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Which of the following is true of carbon?
A) It forms only polar molecules. B) It can form a maximum of three covalent bonds with other elements. C) It is highly electronegative. D) It can form both polar and nonpolar bonds.
Nitrogen gas is first converted into _____ by certain_____ before it enters the land nitrogen cycle
a. nitrate; bacteria b. ammonium; bacteria c. elemental nitrogen; bacteria d. nitrate; bacteria and fungi e. ammonium; bacteria and fungi
How does meiotic cell division produce genetically variable, haploid cells?
What will be an ideal response?
Over time, the same bones in different vertebrates were put to different uses. This falls under the category of
A. heterologous structures. B. analogous structures. C. homologous structures. D. vestigial organs.