Which of the following allowed for
evolutionary innovations in body form?
a. bilateral symmetry
b. segmentation
c. coelomate evolution
d. ectoderm development
e. gastrovascular cavities
B
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Which of the following developmental events occurs
last? a. tissue specialization b. gamete formation c. gastrulation d. cleavage e. organ formation
What kind of bond holds two water molecules to each other?
A) hydrogen bonds B) ionic bonds C) nonpolar covalent bonds D) polar covalent bonds
The TATA box is a(n):
A: DNA sequence in the promoter region of many eukaryotic genes. B: activator sequence necessary for proper translation of eukaryotic genes. C: DNA sequence in the operator of prokaryotic genes. D: enhancer consensus sequence of eukaryotic genes. E :a general transcription factor in eukaryotes.
The two DNA chains in a double helix ________
A) are parallel to each other in 5' to 3' directionality B) have identical base sequences C) wind around each other in such a way that purines are always opposite pyrimidines and vice versa D) are held together due to the charges of their phosphate groups E) have an overall diameter of 2 ?m