Crossing over occurs during

A) prophase I.
B) metaphase I.
C) prophase II.
D) metaphase II.


A) prophase I.

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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).

Biology & Microbiology