What is the function of a clitellum in earthworms?
a. anchoring an animal to its substrate
b. digestion
c. cushions organs
d. glues two organisms together for sperm exchange
e. keeps blood from clotting
ANSWER: d
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Where would you expect to find the plus-end of a microfilament in a crawling cell?
A. near the plasma membrane of the leading edge of the cell B. near the plasma membrane of the trailing end of the cell C. near the cell center D. Answers a and b are both correct.
Organisms capable of producing their own food are known as
a. autotrophs. b. heterotrophs. c. omnivores. d. Herbivores.
The chromosomes line up in the middle of the cell during
A) prophase. B) anaphase. C) metaphase. D) telophase. E) prophase II.
Please match the types of mutations with the statements that most accurately describe them, to test your understanding of their causes.
Induced mutation A) Random change in the DNA arising from errors in replication that occur without a known cause B) Result from exposure to known mutagens, which are primarily physical or chemical agents that damage DNA C) Changing of single base in the DNA code that may result in the placement of a different amino acid D) Addition or deletion of bases that changes the reading of mRNA codons