Fertilization is completed when the sperm nucleus fuses with the ________
Fill in the blank(s) with correct word
egg nucleus
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The feeding chambers inside the sponge are lined with specialized cells that generate a directed water current through the sponge and trap and ingest microscopic food particles. What are these cells called?
a. amoebocytes b. sclerocytes c. choanocytes d. pinacocytes
Which of the following processes is responsible for the conversion of DNA information into messenger RNA?
a. replication b. transcription c. duplication d. translation e. any of these
What is the number of possible unrooted trees for 5 taxa?
A) 5 B) 10 C) 15 D) 20 E) 25
Within the ocean, temperature gradients occur in the water column. Which best describes how temperature variations affect the nutrient levels at the surface?
A) Nutrients are decreased near the surface because upwellings force nutrient-rich water towards the warmer bottom and nutrient-poor water to the colder surface. B) There are always many more nutrients at the warmer surface than in the colder deeper water. C) The nutrient level at the surface is not affected by temperature variations. D) Nutrient levels at the surface increase because upwellings force nutrient-rich water from the colder bottom to the warmer surface.