A zygote is a fertilized egg formed by an egg and a sperm. The zygote undergoes many mitotic events as it develops into a solid ball of cells (ie, blastomeres) called a blastula. What changes occur in this early cleavage?
A. During the initial stages of cleavage, there is a tremendous increase in the number and size of blastomeres.
B. During the initial stages of cleavage, there is a tremendous decrease in the number and size of blastomeres.
C. During the initial stages of cleavage, there is a tremendous increase in the number of cells coupled with a decrease in the size of the cells composing the developing organism.
D. During the initial stages of cleavage, there is no increase in the number of cells of the developing organism, but the size of the cells increases.
C. During the initial stages of cleavage, there is a tremendous increase in the number of cells coupled with a decrease in the size of the cells composing the developing organism.
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A shared derived characteristic for members of the arthropod subgroup that includes spiders would be the presence of _____
A) chelicerae B) an open circulatory system C) an exoskeleton D) a cuticle E) a cephalothorax
What is the function of inhibin?
A. It binds with testosterone and inhibits it. B. It inhibits the development of male secondary sexual characteristics. C. It binds with the Sertoli cells and inhibits the production of sperm. D. It inhibits mitosis. E. It inhibits the secretion of GnRH.
When discussing population features, a cohort is described as
A. all the organisms interacting in the ecosystem. B. all individuals living in the same habitat. C. all the different species in a community. D. all the individuals in a population born at the same time. E. All of the choices are correct.
You have been assigned to analyze some extraterrestrial material recently collected from Mars. After examining a sample using a microscope, you jump up excitedly and shout to your colleagues that you have confirmed the existence of life on Mars. One of your colleagues takes a look at your sample and remarks that all he sees is a single-celled "blob" with little internal structure. Assuming that life on Mars can be classified into similar domains and kingdoms as Earth, to which domain does your "blob" belong?
A. Protista B. Archaea C. Fungi D. Animalia