Cytoplasmic organelles that convert energy from food molecules in ATP and are transmitted from mothers to all their
children through the cytoplasm of the egg are called ____________________. Fill in the blank(s) with the appropriate word(s).
ANSWER: mitochondria
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This cellular structure lacks a membrane:
A. microbody B. nucleus C. nucleoid D. endoplasmic reticulum E. Golgi body
Explain the significance of what Loewi observed in his experiment with the two frog hearts.
A. It showed that neurons communicate with muscle by electrical signals. B. It suggests that a chemical substance released from the first heart, when added to the second heart, reproduced the effects of electrical stimulation. C. It suggests that all vertebrate hearts receive both inhibitory and excitatory signals from different nerves. D. It showed that nerves have a direct electrical effect on heart muscle.
During what stage of meiosis do chromosomes align on the spindle equator in homologous pairs?
An advantage of a complete digestive system over a gastrovascular cavity is that the complete system _____
A) excludes the need for extracellular digestion B) allows for specialized regions with specialized functions C) allows extensive branching D) facilitates intracellular digestion