Which of the following is incorrectly paired 

a. NodA is an N-acyltransferase

b. NodB is a chitin-oligosaccharide deacetylase

c. NodB is a N-acyltransferase

d. NodC is a chitin-oligosaccharide synthase

f. NodC is a chitin-oligosaccharide deacetylase

TLS Online TPP Program

#Question id: 1563

#Unit 4. Cell Communication and Cell Signaling

A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to ________.

TLS Online TPP Program

#Question id: 12330

#Unit 10. Ecological Principles

Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?

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#Question id: 19874

#Unit 13. Methods in Biology

Adding homopolymer tails to the 3’ end of DNA by an enzyme such as

TLS Online TPP Program

#Question id: 11929

#Unit 10. Ecological Principles

This mating system is thse one most commonly seen in animals. Males attempt to mate with as many females as possible and rarely form a lasting pair bond. 

TLS Online TPP Program

#Question id: 15301

#Unit 5. Developmental Biology

Initially, the morula does not have an internal cavity. However, during a process, cavitation, the trophoblast cells secrete fluid into the morula to create a blastocoel, these 

membranes of trophoblast cells contain_______?