Small circular, extrachromosomal DNA segments are known as _______.  

A.  vectors
B.  plasmids
C.  clones
D.  RNA


B.  plasmids

Biology & Microbiology

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Situated in the center of the flower, the structure in which female gametophytes form is called the ____

a. petal b. carpel c. stamen d. anther e. sepal

Biology & Microbiology

Which of the following types of muscle is voluntary?

a. Cardiac b. Skeletal c. Smooth d. Rough

Biology & Microbiology

Which of the following organisms have cells walls made of chitin?

A. Animals B. Bacteria C. Fungi D. Plants

Biology & Microbiology

Which one of the following is TRUE regarding the "recycling" of hemoglobin?

A) The peptide chains are broken down into their constituent fatty acids. B) The iron atoms are returned to the red bone marrow. C) The heme groups are converted to urine by the kidneys. D) The peptide chains are transported intact to the bone marrow for reuse. E) The heme groups with their iron atoms are transported to the spleen.

Biology & Microbiology