Crossing over occurs during
A) prophase I.
B) metaphase I.
C) prophase II.
D) metaphase II.
A) prophase I.
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A peptide bond _____
A) forms between the functional R-groups of different amino acids B) forms between the central carbon and the amino R-group of a single amino acid C) forms the primary structure of proteins D) does not play a role in maintaining the tertiary structure of proteins
Homologous chromosomes contain the same ____ but may contain different ____.
A. alleles genes B. sister chromatids, genes C. alleles, sister chromatids D. genes, sister chromatids E. genes, alleles
Which of the following membrane activities requires energy from ATP?
A) facilitated diffusion of chloride ions across the membrane through a chloride channel B) movement of Na+ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid C) movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than inside the cell D) movement of carbon dioxide out of a paramecium
If a ball begins to roll down an incline, its ________ energy is converted into ________ energy.
Fill in the blank(s) with the appropriate word(s).