Indentation in the plasma membrane of animal cells during cell division; formation marks the start of cytokinesis.
What will be an ideal response?
cleavage furrow
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Which protozoan parasite can invade the intestinal wall using a protease enzyme that not only breaks down the wall tissue but also cleave IgA, IgG, and complement components?
A. Cryptosporidium parvum B. Giardia intestinalis C. Cyclospora cayetanensis D. Entamoeba histolytica
The energy that a parent puts into the growth, feeding, and care of offspring is called:
a. reproductive investment. b. the mating system. c. reproductive success. d. kin selection. e. total reproductive output.
Which molecule is the product of the intermediate step which is a direct input into the Krebs cycle?
A) ATP B) pyruvic acid C) carbon dioxide D) NADH E) acetyl CoA
When E. coli cells produce the amino acid tryptophan, a cluster of five genes is transcribed together. This cluster of genes is referred to as the
A. trp operon. B. trp regulator. C. trp suppressor. D. trp transcriptional operator. E. trp promoter.