Blog

Which of the following features is unique to animals?

Which one of these groups of invertebrate animals includes organisms with pharyngeal gill slits?

Robber frogs (Brachycephalus sp.) have been experiencing large die-offs due to an infectious organism. This organism is multicellular, has a filamentous body form, cell walls made of chitin and some of the cells are flagellated. Genetic analysis shows that the organism has haploid nuclei. Based on these characteristics, this disease is most likely caused by ________________________________.

If an embryo from an animal with indeterminate cleavage splits in half at the eight cell stage, what is the most likely result?

Some recently fertilized eggs are allowed to develop in order to determine what type of organism they are. As they develop, the mouth develops secondarily (a deuterostome), and the larvae have bilateral symmetry, a true coelom and a post-anal tail.  The adults show advanced body plan segmentation. Based upon your observations, you determine that this organism is a type of:

What characteristic is shared by both fungi and humans?

In humans, Preimplantation Genetic Diagnosis (PGD) is a genetic reproductive technology that allows a doctor to remove a single cell from an 8-cell stage embryo and test the single cell for the presence of genetic problems. As long as there are no genetic problems, the remaining 7-cell embryo develops normally (and eventually becomes a child). This technology is possible because at the 8-cell stage of development, human cells are: _______________________________  (Select all that apply)

Amphibians can be viewed as transitional between an aquatic life and a life that can be lived independently of water because:

Which of the following characters is seen in the angiosperms (flowering seed plants), and is not seen in other seeded vascular plants?

What is the function of gametangia in plants?