Which of the following is false concerning fertilization?
A) Several sperm must contribute their DNA to the egg.
B) Enzymes are released from the acrosome of the sperm to penetrate the egg.
C) Most sperm die on their way to the egg.
D) The process can take hours to complete.
A
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Answer the following statements true (T) or false (F)
1. A raw peanut with almost 2 calories of energy has 2,000 times the energy required to raise the temperature of 1 gram water by 1°C. 2. You are cold. Your body begins a shivering response. You quickly rub your hands together, and the friction produces a small amount of heat. The heat is evidence of increasing entropy. 3. Each protein in an electron transport chain is sequentially oxidized, then reduced, allowing small amounts of energy to be released for use by the cell during each transfer. 4. Cofactors, required to stabilize enzymes, are often in our diets as vitamins, minerals, and metals. 5. Whenever ATP is produced by a chemical reaction, some energy is lost into the surroundings as heat.
Which of the following is the primary function of
pollen grain coats? a. differentiates upon contact with the flower b. protects from harsh chemicals and dehydration c. prevents competing pollen grains from being able to fertilize a flower d. provides an aerodynamic structure to allow them to travel on wind currents e. none of these
Activity of the neurotransmitter acetylcholine is brief because it
A) "self-destructs" shortly after leaving the presynaptic neuron. B) is transported back into the presynaptic neuron. C) diffuses out of the synaptic cleft. D) is pumped out of the synaptic cleft by the sodium-potassium pump. E) is rapidly broken down by enzymes in the synaptic cleft.
Which of the following is not in the same clade as the others?
a. Birds b. Dinosaurs c. Lizards d. Crocodiles e. Alligators