A distinctive type of larva shared by several phyla of invertebrates and considered to be important in phylogeny is the

A. gastrula.
B. metamere.
C. paedomorph.
D. tadpole.
E. trochophore.


Answer: E

Biology & Microbiology

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What is the most significant advantage of using RNAi to study development?

A) Geneticists have only been able to identify a subset of the genes involved in development. B) Genetic studies of a single gene can be completed without creating new mutant organisms. C) RNA is easy to isolate. D) RNAi causes phenotypes not typical of in vivo development.

Biology & Microbiology

Which sequence most accurately describes the

complete path of blood through the circulatory system of a fish? a. atrium >>> ventricle >>> gill capillaries >>> atrium >>> ventricle >>> all other capillaries b. atrium >>> ventricle >>> gill capillaries c. gill capillaries >>> atrium >>> ventricle >>> all other capillaries d. gill capillaries >>> all other capillaries >>> atrium >>> ventricle e. none of these

Biology & Microbiology

The type of photoreceptor that is more concentrated in the center of the retina, allows for color vision and responds to bright light is called a ________ cell.

Fill in the blank(s) with correct word

Biology & Microbiology

Classification.The following items are organelles found in animal cells. Respond to the statements below with reference to these organelles.

A. This organelle is the site of polypeptide assembly. B. This two-part organelle is found in the endoplasmic reticulum. C. Aerobic respiration occurs in this organelle. D. This organelle has its own DNA. E. The cellular digestion and disposal of biological molecules occurs inside this organelle. F. This organelle plays a role in cell defense. G. The packaging of secretory proteins occurs in association with this structure. H. This organelle comprises a smooth section and a rough section. I. This organelle is involved in lipid production and protein transport.

Biology & Microbiology