While looking at some seawater through your microscope, you spot the egg of an unknown animal. Which of the following tests could you use to determine whether the developing organism is a protostome or a deuterostome? See whether the embryo _____.
A) develops germ layers
B) exhibits spiral cleavage or radial cleavage
C) develops a blastopore
D) develops an archenteron
Ans: B) exhibits spiral cleavage or radial cleavage
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Answer the question using the accompanying figure. Water balance is maintained by the structures labeled ____
a. 1 and 3 b. 5 and 9 c. 7 and 8 d. 6 and 9 e. 1 and 6
Mammal-like reptiles arose during which time period?
a. Triassic period b. Cambrian period c. Devonian period d. Cretaceous period e. Carboniferous period
Which of the following statements regarding cells is false?
A) All cells are enclosed in a membrane that maintains internal conditions different from the surroundings. B) All cells have a cell wall. C) All cells can interconvert forms of energy. D) All cells have DNA as their genetic material.
Where are proteins in the chloroplast synthesized?
(a) in the cytosol (b) in the chloroplast (c) on the endoplasmic reticulum (d) in both the cytosol and the chloroplast