Select all of the following that are characteristics of crustaceans.
_____ two pairs of antennae.
_____ antennal glands.
_____ maxillary glands
._____ calcium carbonate deposited in the exoskelton.
_____ external fertilization.
__X__ two pairs of antennae.
__X__ antennal glands.
__X__ maxillary glands
.__X__ calcium carbonate deposited in the exoskelton.
_____ external fertilization.
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A skin cell in G2 of interphase has _______________ as much DNA as it had in G1
A. half B. twice C. the same amount D. one-fourth E. four times
Endosperm tissue of angiosperms has what ploidy level?
A. n B. 2n C. 3n D. 4n E. 8n
Receptor protein-tyrosine kinases add phosphate groups to which amino acid on the receptor?
a. serine b. glycine c. threonine d. tryptophan e. tyrosine
Female gametes complete meiosis II at ____________________. Fill in the blank(s) with the appropriate word(s)