If a scientist found very high concentrations of organic biomarkers deep inside a 3.9 billion year old meteorite, how would this effect the explanation of the origins of life on Earth?
A. This would prove the extraterrestrial origin of life.
B. This would disprove the terrestrial origin of life.
C. This would provide evidence for the extraterrestrial origin of life.
D. This would provide evidence for the uniqueness of life on earth.
Answer: C
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Which of the following model organisms is/are LEAST suited to study the timing of morphological changes during embryonic development?
A. Mus musculus B. Gallus gallus C. Brachydanio rerio D. Drosophila melanogaster E. Mus musculus and Gallus gallus
A ________ is the organelle that fuses with endosomes and supplies hydrolytic enzymes necessary for the digestion of the materials within the endosome.
Fill in the blank(s) with the appropriate word(s).
Which of the following is NOT a morphogen?
A. Activin B. Noggin C. proteins D. Cadherin E. protein produced by Spemann's organizer (dorsal lip of a gastrula)
Which of the following is associated with a prokaryote?
a. Golgi body b. rough ER c. nucleoid d. peroxisomes