At which developmental stage should one be able to first distinguish a diploblastic embryo from a triploblastic embryo?

TLS Online TPP Program

#Question id: 7274

#Unit 5. Developmental Biology

The following experiment is designed to study the role of several hormones in the regulation of metamorphosis in frogs.

Group #	Treatment	Days to Metamorphosis
1	Saline	30
2	Prolactin	> 100
3	TSH	15
4	Thyroxine	10
5	Corticosterone	30
6	Thyroxine + Corticosterone	5
7	Prolactin + TSH	30
8	Thyroid gland removed	> 100

 If the thyroid gland were removed from the tadpoles in Group 3, metamorphosis would

TLS Online TPP Program

#Question id: 2979

#Unit 2. Cellular Organization

Use the data in the accompanying table to answer the question. Minutes Spent in Cell Cycle Phases-

Cell type	G1	S	G2	M
Beta	18	24	12	16
Delta	100	1	0	0
Gamma	18	48	14	20

The data in the table were obtained from a study of the length of time spent in each phase of the cell cycle by cells of three eukaryotic organisms designated beta, delta, and gamma. What is the best explanation for the data associated with delta cells?

TLS Online TPP Program

#Question id: 11562

#Unit 7. System Physiology – Animal

The relationship between the insect hormones ecdysteroid and PTTH is an example of ________.

TLS Online TPP Program

#Question id: 2993

#Unit 2. Cellular Organization

During meiosis, a defect occurs in a cell that results in the failure of spindle microtubules binding at the kinetochores. Which of the following statements describes the most likely result of such a defect?

TLS Online TPP Program

#Question id: 18077

#Unit 7. System Physiology – Animal

During which stage of the general adaptation syndrome (GAS) does the body adjust to the new stressor?