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: 20414

#Unit 3. Fundamental Processes

Which of following is a gene that contains expressed regions of DNA called exons, split with unexpressed regions called introns (also called intervening regions)

TLS Online TPP Program

#Question id: 20419

#Unit 3. Fundamental Processes

Purines in nontemplate strand applies more closely to Exons is best described by

TLS Online TPP Program

#Question id: 20420

#Unit 3. Fundamental Processes

The LDL receptor gene consists of 18 exons, some of which are related to EGF precursor exons and some of which are related to the C9 blood complement gene, is an example of 

TLS Online TPP Program

#Question id: 20538

#Unit 12. Applied Biology

Aromatic hydrocarbons including benzene, toluene, ethylbenzene and xylene collectively referred as BTEX compounds. Which of them is considered as carcinogenic?

TLS Online TPP Program

#Question id: 20539

#Unit 12. Applied Biology

Aromatic hydrocarbons including benzene, toluene, ethylbenzene and xylene collectively referred as BTEX compounds. Which of them are not considered as carcinogenic?

1. Benzene

2. Toluene

3. Ethylbenzene

4. Xylene

Which of them is a correct option?

TLS Online TPP Program

#Question id: 20540

#Unit 12. Applied Biology

Toluene, ethylbenzene and xylene must be kept to ________levels in drinking and recreational waters due to their toxicity