Which of the following statements about sperm entry is true?
a. The fertilization cone formed by microvilli of the egg membrane contracts and draws the
sperm inward.
b. The egg phagocytizes the acrosome of the sperm so it can enter the cell.
c. The cilia on the egg membrane beat and sweep the sperm inside.
d. The sperm releases calcium ions, which make the egg membrane permeable to its entry.
e. The egg secretes bindin protein, which allows sperm penetration.
A
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Answer the following statements true (T) or false (F)
1. Red algae, green algae, and plants are so closely related that they are grouped in the same supergroup by most biologists. 2. Animals and fungi are more closely related to each other than either is to plants. 3. Fungus-like protists are more related to true fungi in the supergroup Opisthokonta than they are to members of any other supergroup. 4. Protists are organisms that are generally microscopic, live in moist environments, and cannot be classified in the animal, plant, or fungal kingdoms.
The cnidarian Hydra reproduces asexually by fragmentation
Indicate whether the statement is true or false.
What is the main purpose of the extracellular matrix surrounding osteocytes?
a) Cell growth b) Cell division c) Bone repair d) Bone strength
The atmosphere performs several essential ecological functions. One of these is to:
a. protect Earth from all infrared radiation. b. reduce the amount of visible light reaching Earth c. provide plants with nitrogen needed for photosynthesis d. protect Earth from microwave radiation e. protect Earth from most ultraviolet radiation