The secondary structure of a protein forms ____

a. pleated sheets or coils
b. when pleated sheet regions fold back on themselves
c. from interactions between polypeptide chains
d. from covalent bonding between amino acids
e. a functional chromatin uni


a

Biology & Microbiology

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This tissue gives pear flesh a gritty texture and makes seed coats hard:

a. xylem b. collenchyma c. phloem d. sclerenchyma e. parenchyma

Biology & Microbiology

Which of the following types of evidence supports the multiregional model for human evolution?

1.genetic markers on the Y chromosome 2.fossil evidence 3.mitochondrial DNA 4.microsatellite data 5.autosomal gene sequences

Biology & Microbiology

Striated muscle has light and dark bands. The light bands are called ________, whereas the dark bands are called ________

A) Z lines; M lines B) H zones; M zones C) A bands; I bands D) I bands; A bands E) M lines; A bands

Biology & Microbiology

The evolution of eukaryotic cells began approximately ________ years ago

A) 1 million B) 10 million C) 1.7 billion D) 3.8 billion E) 4.6 billion

Biology & Microbiology