Clams, oysters, and scallops are called bivalves because they have
a. a pair of eyes.
b. bilateral symmetry.
c. a double foot region.
d. a shell made up of two halves.
e. two sexes.
D; The shells are the valve, hence the name. Bivalves do not all have a pair of eyes (choice a) and their foot region is not double (choice c). Animals typically have bilateral symmetry (choice b) and often have two sexes (choice e), so this would not be a particularly distinctive feature on which to base a name.
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You are working in a medical research lab and have to determine if a patient is heterozygous or homozygous for a particular restriction site
After treating the DNA with a restriction enzyme that cuts at that site, you subject the sample to gel electrophoresis. How many bands would be indicative of the heterozygous condition? A. one B. two C. three D. four E. Impossible to answer from the information given.
The ___________ nuclei are masses of gray matter deep within each cerebral hemisphere, that integrate motor commands to ensure that the proper muscle groups are stimulated or inhibited.
Fill in the blank(s) with the appropriate word(s)
Inner synovial membrane
What will be an ideal response?
Which of the following cells would MOST likely be damaged by penicillin?
a. gram+ bacteria b. gram- bacteria c. human cells d. yeast cells