Some regions of a polypeptide may coil or fold back on themselves. this is called and the coils or folds are held in place by (concept 5.4) a. tertiary structure covalent bonds b. primary structure covalent bonds c. tertiary structure hydrogen bonds d. secondary structure hydrogen bonds e. secondary structure peptide bonds

Ry was studying two populations of the same species of lizards. one population lived on an island and the other lived on the mainland. both populations were affected by a hurricane that hit the island and the mainland with equal force. a year later, henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. which best describes a conclusion he might have reached? gene flow greatly affects small populations, but large populations can recover. genetic drift greatly affects small populations, but large populations can recover. gene flow greatly affects large populations, but small populations can recover. genetic drift greatly affects large populations, but small populations can recover.

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii