DNA strands can be clipped crosswise at selected positions by using enzymes called ________.

A. palindromes
B. reverse transcriptases
C. restriction endonucleases
D. ligases
E. DNA polymerases


Answer: C

Biology & Microbiology

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The pupil is the ________.

Fill in the blank(s) with the appropriate word(s).

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Luke sprained his ankle, tearing some of the collagen protein that forms his ligaments. Some types of collagen consist of three polypeptide chains twisted together to form a rope-like strand. What level of protein structure does this rope-like strand represent?  

A.  Primary B.  Secondary C.  Tertiary D.  Quaternary

Biology & Microbiology

Frameshift mutations change the number of ____ in the gene and usually cause large-scale changes in the ____ sequence of the protein

a. polypeptides; nucleotide b. amino acids; allelic c. alleles; amino acid d. nucleotides; amino acid e. amino acids; nucleotide

Biology & Microbiology

The primary feeding type for lophophorates is:

a. scavengers. b. attachment predators. c. herbivores. d. filter feeders. e. infaunal detritivores.

Biology & Microbiology