TLS Online TPP Program

#Question id: 5669


What is the reproductive difference between sea urchins and mammals is?

#Unit 5. Developmental Biology
  1. The sea urchin egg completes meiosis prior to fertilization, but meiosis in mammals is completed after fertilization

  2. Sea urchin eggs and sperm are of equal size, but human eggs are much bigger than mammal’s sperm

  3. Sea urchins, but not mammals, have a need to block polyspermy, because only in sea urchins can there be more than one source of sperm to fertilize the eggs

  4. Sea urchin zygotes get their mitochondria from the sperm, but mammals zygote get their mitochondria from the egg.

More Questions
TLS Online TPP Program

#Question id: 11150

#Unit 7. System Physiology – Animal

Use the information in the table to answer the question.


Calculate the equilibrium potential for potassium. Assume a temperature of 37°C.

TLS Online TPP Program

#Question id: 11151

#Unit 9. Diversity of Life Forms

What conclusion can be drawn validly from these data?

TLS Online TPP Program

#Question id: 11152

#Unit 9. Diversity of Life Forms

When sufficient heat is applied, double-stranded DNA denatures into two single-stranded molecules as the heat breaks all of the hydrogen bonds. In an experiment, molecules of single-stranded DNA from species X are separately hybridized with putatively homologous single-stranded DNA molecules from five species (A-E). The hybridized DNAs are then heated, and the temperature at which complete denaturation occurs is recorded. Based on the data below, which species is probably most closely related to species X?


TLS Online TPP Program

#Question id: 11153

#Unit 9. Diversity of Life Forms

A researcher wants to determine the genetic relatedness of several breeds of dog (Canis familiaris). The researcher should compare homologous sequences of __________ that are known to be __________.

TLS Online TPP Program

#Question id: 11154

#Unit 9. Diversity of Life Forms

Concerning growth in genome size over evolutionary time, which of these does not belong with the others?

TLS Online TPP Program

#Question id: 11155

#Unit 9. Diversity of Life Forms

Nucleic acid sequences that undergo few changes over the course of evolutionary time are said to be conserved. Conserved sequences of nucleic acids