Earthworms move by using
a. a hydroskeleton and synergistic muscle pairs.
b. an internal bony skeleton and skeletal muscles.
c. an exoskeleton and skeletal muscles.
d. a hydroskeleton and antagonistic muscle pairs.
e. an exoskeleton and synergistic muscle pairs.
D
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The zig-zag and solenoid models are associated with the _______ level of DNA organization
A. histone B. 11nm fiber C. beads-on-a-string D. 30 nm fiber E. scaffold protein
A pine seed is composed primarily of
a. the embryo. b. female gametophyte. c. seed coats. d. the embryo and seed coats. e. the embryo, seed coats, and female gametophyte
If two strains of true-breeding plants that have different alleles for a certain character are crossed, their progeny are:
A: not true-breeding. B: called the F1 generation. C: called hybrids. D: heterozygous for that character. E: all of the above.
Which of these biotechnologies involves the process of nuclear transfer?
A) cloning B) recombinant DNA C) genomics D) selective breeding