What evidence is there that choanoflagellates were the ancestors to animals? What will be an ideal response?
ANSWER: These protists have many features in common with sponges, the simplest animals. They are
flagellated and the use the flagella to draw water in from which they filter food. In addition,
they express proteins that resemble both adhesions proteins (that hold animal cells together)
and animal signaling pathway proteins (that aid in food and pathogen detection).
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A class of gene in multicellular eukaryotes called piwi (the name derives from a Drosophila gene called P-element induced wimpy testis) encodes regulatory proteins involved in maintaining incomplete differentiation and stable cell division in germ-
line and stem cells. PIWI proteins represent a clade within a larger familythat includes ______________ proteins. A. ENCODE B. Argonaute C. Dicer D. Drosha
The ability of alpine pennycress to decontaminate
soil may be transferable to other plants because basically this ability is due to a. the structure of its chloroplasts. b. the structure of its membranes. c. the structure of its central vacuole. d. the structure of its plastids. e. a gene.
How many mature sperm does one secondary spermatocyte ultimately produce?
a. 1 b. 2 c. 3 d. 4
A cell that contains a nucleus is called a(n) (prokaryotic/archaeal/eukaryotic) cell
What will be an ideal response?