A solution is at equilibrium across a plasma membrane. If 50 molecules were to enter the cell, how many molecules would need to exit the cell in order to maintain the equilibrium?
A . 50
B. 75
C. 25
D. 0
E. 100
Answer: A. 50
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Which of the following is a correct matching of the researcher with their discovery?
A. Pauling provided information on primary structure in biological molecules. B. Franklin suggested that DNA was a helix with more than one strand and that there were about 10 bases per turn of the DNA C. Watson and Crick collected a large amount of X-ray data on the structure of DNA. D. Chargaff demonstrated that the adenine and cytosine bases and the uracil and guanine bases interacted in some manner.
Target cells
a. are found only in specific endocrine glands. b. are equipped with specific receptor molecules. c. are muscle cells. d. may occur in any part of the body. e. are equipped with specific receptor molecules and may occur in any part of the body.
What type of bond links two polynucleotide chains to each other in a double helix DNA?
A.) glycosidic bond B.) hydrogen C.) phosphodiester D.) phosphoanhydride E.) disulfide
Trypanosoma brucei is transmitted by
a) tsetse flies. b) body lice. c) houseflies. d) head lice.