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
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The pupil is the ________.
Fill in the blank(s) with the appropriate word(s).
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
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
The primary feeding type for lophophorates is:
a. scavengers. b. attachment predators. c. herbivores. d. filter feeders. e. infaunal detritivores.