Taxis - movement toward or away stimuli

TLS Online TPP Program

#Id: 3513

#Unit 2. Cellular Organization

In the fruit fly, gene sizes have a bimodal distribution—many are short but some are quite long

TLS Online TPP Program

#Id: 7613

#Unit 5. Developmental Biology

Acrosomal enzymes (acrosin and MMP2) as well as the enzymes that help establish capacitation, are inhibited by zinc, the accumulation of zinc on the zona pellucida and in the surrounding cumulus form a “zinc shield” that prevents further sperm entry

TLS Online TPP Program

#Id: 3688

#Unit 2. Cellular Organization

Bacillus anthracis has two large plasmids (extrachromosomal DNA molecules), one of which has a pathogenicity island that includes the gene encoding the anthrax toxin.

TLS Online TPP Program

#Id: 2498

#Unit 13. Methods in Biology

Gradient Gels electrophoresis are performed using gradient of  acrylamide Concentration that varies uniformly from, typically, 5% at the top of the gel to 25% acrylamide at the bottom of the gel.

TLS Online TPP Program

#Id: 3696

#Unit 2. Cellular Organization

Not all genes are essential. In yeast and flies, deletions of 50% of the genes have detectable effects