In most eumetazoans the innermost tissue layer during development is the
a. mesoderm.
b. epiderm.
c. mesoglea.
d. endoderm.
e. ectoderm.
D
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Ringworm is a skin infection with a fungus, not a worm! In this case, the fungus acts as a
a. decomposer. b. parasite. c. pathogen. d. predator
Which of the following provides the specificity of the CRISPR/Cas gene editing system?
A. an antibody-like region of the Cas nuclease B. the guide RNA (crRNA) carried by the Cas nuclease C. the amino acids at the amino terminus of the Cas nuclease D. the amino acids at the carboxyl terminus of the Cas nuclease
Some flowers bloom in the spring, while others bloom in the summer. This is an example of reproductive isolation.
A. prezygotic B. sympatric C. allopatric D. parapatric E. postzygotic
What fraction of the time will the cross of Aa Bb Cc with Aa Bb Cc produce an offspring of genotype
aa bb cc? a. 1/64 b. 1/32 c. 3/64 d. 1/16 e. 9/64