The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle). Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The fourchambered hearts of birds and mammals are best described as ________.

TLS Online TPP Program

#Question id: 9236

#SCPH06 I Botany

Which of the following outcomes is caused by excessive nutrient runoff into aquatic ecosystems?

TLS Online TPP Program

#Question id: 24449

#SCPH01 Biochemistry

A 10-year-old boy was diagnosed with childhood absence epilepsy. His EEG showed a bilateral synchronous, symmetrical 3-Hz spike-and-wave discharge. Absence seizures

TLS Online TPP Program

#Question id: 578

#I Life Science/ Life Sciences Group – I-V

An enzyme that catalyzes conversions of L-sugars to D-sugars is called a/an ________.

TLS Online TPP Program

#Question id: 3687

#SCPH05 I Biotechnology

As the two strands of the double helix are separated, the positive supercoiling interferes with the further unwinding of DNA. Which of the following enzyme makes a break in a strand of DNA to release the supercoiling and facilitate the replication to occur?

TLS Online TPP Program

#Question id: 3869

#SCPH06 I Botany

Which one of the following statements about E. coli RNA polymerase (core enzyme) is false?