What are the major structural components of a cell membrane?
a. glycolipids and cellulose
b. glycolipids and proteins
c. phospholipids and cellulose
d. phospholipids and proteins
Ans: d. phospholipids and proteins
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Spontaneous mutations include
A. Depurination, deamination, errors in DNA replication B. UV light, radiation, deamination, depurination C. UV light, radiation, deamination, errors in replication D. UV light, errors in DNA replication, deamination, depurination
Which of the following is NOT a risk factor associated with cancer?
A. Advanced age B. Smoking cigarettes C. Family history of cancer D. Viral infections E. All of these are risk factors associated with cancer
There are more species of beetles than any other animal. How many species of beetles have been described?
a. About 50,000 b. About 100,000 c. About 300,000 d. More than one million
The locomotive behavior of earthworms is enabled by contraction of their longitudinal and circular muscles; this is seen through their typical burrowing behavior. Nematodes, however, contract their longitudinal muscles against the pressure of fluid in
their bodies to produce a whiplike motion that enables them to move. Suppose you place an earthworm and a nematode in a watery solution. Which do you think would be able to move more easily, and why? A) the earthworm, because it uses two sets of muscles to help it move through the watery solution B) the nematode, because its whiplike motion will easily propel it through the watery solution C) the earthworm, because it can contract and expand its muscles to burrow down through the watery solution D) the nematode, because it can move its paddle-like appendages on its segments to help it move through the watery solution