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TLS Online TPP Program

#Question id: 7260

There are maternally-determined variations along the animal-vegetal axis that are necessary for normal development in sea urchin. Which of the following statements about regulation in sea urchin embryos is consistent with that fact?

#Unit 5. Developmental Biology
  1. Up until the hatching of the embryo as a pluteus larva, any blastomere can be separated from the others and will regulate to go on and develop into a fully formed and full size larva.
  2. Up until the hatching of the embryo as a pluteus larva, any blastomere can be separated from the others and will regulate to go on and develop into a fully formed, yet smaller, larva.
  3. Blastomeres from the animal or vegetal poles of the embryo can be isolated and will go on to form an embryo, as long as either an animal or vegetal pole is included.
  4. Blastomeres at the 4-cell stage each still possesses a portion of the original animal-vegetal axis, and if isolated will go on to form a fully formed, yet smaller, larva.
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TLS Online TPP Program

#Question id: 23795

#Unit 7. System Physiology – Animal

Correctly match the responses with given cells according their functions;

Cells

Responses

1.Rods, cones and horizontal cells

p. hyperpolarizing potential

2.Bipolar cells

q. depolarizing potential

3.Amacrine cells

r. Either hyperpolarizing or depolarizing potential

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: 21120

#Unit 12. Applied Biology

Which one of the following is a biomarker for hypertension?
TLS Online TPP Program

#Question id: 4890

#Unit 8. Inheritance Biology

A strain of Neurospora crassa, unable to synthesize the vitamin thiamine (t), is crossed with a strain that cannot synthesize the amino acid arginine (a). What information can be obtained from the resultant frequencies of ascospore patterns?

 A) The two loci (a) and (t) are independent assortment of each other

B) Both genes are closely linked to their respective centromeres.

C) no crossovers occurred between either gene and its centromere.

D) These two gene may reside on different chromosomes.
TLS Online TPP Program

#Question id: 11559

#Unit 7. System Physiology – Animal

The steroid hormone that coordinates molting in arthropods is ________.