Watson and Crick based their conclusion that DNA is a double helix mainly on experimental results and measurements from
A) Chargaff, Wilkins, and Franklin.
B) Avery, MacLeod, and McCarty.
C) Hershey and Chase.
D) Charles Darwin.
A) Chargaff, Wilkins, and Franklin.
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Human saliva contains which of the following enzymes?
a. aminopeptidase b. amylase c. chymotrypsin d. pepsin e. trypsin
Arrange the steps of an allergic reaction in the proper order
1) allergic symptoms appear 2) allergin binds with IgE 3) IgE combines with mast cell receptors 4) mast cell releases histamine 5) plasma cells sensitized a. 5 ? 3 ? 2 ? 4 ? 1 b. 1 ? 5 ? 2 ? 4 ? 3 c. 5 ? 2 ? 4 ? 3 ? 1 d. 1 ? 4 ? 5 ? 2 ? 3 e. 4 ? 5 ? 2 ? 3 ? 1
If there are 20 duplicated chromosomes in a cell, how many centromeres are there?
A) 10 B) 20 C) 30 D) 40
In humans, which of these structures is not made of cartilage?
A. outer ear B. knee cap C. larynx D. intervertebral disks of the backbone E. tip of the nose