The radial symmetry of adult echinoderms could best be described as ________
A) biradial
B) bilateral
C) fourfold symmetrical
D) fivefold symmetrical
D
You might also like to view...
If molecular techniques predict the phylogeny shown here, which of the following shows the expected order of appearance of species in the fossil record from earliest appearing to most recently appearing?
A. chara, liverworts, hornworts, lycophytes B. chara, lycophytes, liverworts, hornworts C. lycophytes, hornworts, liverworts, chara D. lycophytes, liverworts, hornworts, chara E. hornworts, chara, lycophytes, liverworts
Primary consumers eat:
a. detritivores b. decomposers c. producers d. other consumers e. any organism that is at a different trophic level
Imagine that you and your colleagues are working in a lab to develop a protein synthesis system for a new type of synthetic cell. During your brainstorming sessions, you propose that polycistronic mRNA would be much more useful than mRNA that is only translated into one protein. This would allow for multiple proteins necessary for a particular function to be translated together. One of your colleagues says that is a good idea, but if you decide to go with polycistronic mRNA, you'd better make sure to use a prokaryotic translation system. Why might it be problematic to use a eukaryotic translation system with polycistronic mRNA?
a. Eukaryotic start and stop codons are different from prokaryotic start and stop codons. b. Introns would always prevent translation of the mRNA. c. Prokaryotic ribosomes do not detach from mRNA when they reach a stop codon d. Eukaryotic ribosomes initiate translation by binding to the 5?-cap, which is only at the end of the mRNA.
How can reproductive isolation in plants be mediated through pollinators?
What will be an ideal response?