Which of the following statements about cilia is false?
a. They are about 10 micrometers in length, and cells that have them usually have many of them.
b. They can be used to move fluids over the cell surface or to move the cell through fluids.
c. They are projections of the plasma membrane supported by microfilaments.
d. Their movement relies upon the motor activity of axonemal dynein.
Ans: c. They are projections of the plasma membrane supported by microfilaments.
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Bacterial toxins are chemical products made by bacteria. A person ingests some honey containing Clostridium botulinum. The C. botulinum is actively growing and releases toxin in the honey. The person becomes ill from ingesting the toxin. This is an example of a/an ________.
A. infection B. intoxication C. pandemic D. hemolysin E. toxemia
The Y-shaped part of the DNA molecule where the actual replication process occurs is called the replication ________.
A. junction B. fork C. tongue D. splice
If an animal is a vertebrate, this means that the animal
A. does not have a backbone. B. does not have true tissues. C. has a backbone. D. has a complete digestive tract. E. does not have a complete digestive tract.
Assuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring?
a. 1111 b. 1331 c. 1221 d. 4321