Blood flow through vessel A, 1 mm in diameter, occurs with a 10 kPa pressure gradient from one end to the other. Blood flow through vessel B, 2 mm in diameter, occurs with a 1 kPa pressure gradient from one end to the other. Other conditions are identical. Compared to vessel A, blood flow in vessel B is ____.
a. 1/10 as fast
b. 1.6 times faster
c. 16 times slower
d. 10 times faster
Ans: b. 1.6 times faster
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A tRNA with the anticodon sequence 5? IUA 3? will not normally exist because
A) 5? UAA 3? is a stop codon. B) I is not a base present in tRNAs. C) it will recognize codons for different amino acids. D) 5? UAU 3? and 5? UAC 3? both specify tyrosine.
Major gene reshuffling takes place during
a. telophase I. b. metaphase I. c. anaphase I. d. metaphase II. e. anaphase II
Which cells make you immune to a disease that you were previously exposed to?
a. effector cells. b. memory cells. c. dendritic cells. d. phagocytes. e. fibroblasts.
A dihybrid cross is a cross that involves two pairs of contrasting traits. Mendel's law of independent assortment can be used to predict the genotypes and phenotypes of the offspring produced in such a cross. Which of the following is an example of a dihybrid cross?
A) AABB x AABB B) aabb x aabb C) AaBb x AaBb D) Aa x Aa