Why is more than one sperm needed for fertilization to occur, when only one sperm actually penetrates the egg?
a. the sperm work together to lower the acidity in the uterus for survival
b. the sperm work together reduce drag as they swim up the oviduct
c. the sperm work together to surround the egg prior to fertilization
d. the sperm work together to break down the egg's protein layer
e. the sperm work together to break down the cap on the sperm's head
ANSWER: d
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What are the two major components of cell membranes?
A. glycolipids and phospholipids B. cholesterol and proteins C. phospholipids and carbohydrates D. phospholipids and cholesterol E. phospholipids and proteins
If two genes are homologous, then it can be said that they are
A. derived from different ancestral genes but have a similar function. B. derived from the same ancestral gene. C. found only outside the nucleus in the mitochondrion or chloroplast. D. derived from different ancestral genes and have different functions. E. related through environmental natural selection.
How do gap junctions differ from desmosomes?
a. A gap junction bridges the space between cells. b. A gap junction is a much larger space between cells. c. A gap junction provides communication between cells. d. A gap junction can control the passage of materials between cells. e. A gap junction requires the use of ATP to open and close its channels.
In a honeybee society, the worker bees are all male. Indicate whether the statement is true or false