Veins and venueles have valves in them, but arteries and arterioles do not.

a. true
b. false


Ans: a. true

Biology & Microbiology

You might also like to view...

DNA microarray technology is used to measure the

A. levels of specific proteins expressed by cells. B. levels of specific RNAs expressed by cells. C. genetic complexity of cells of interest. D. DNA content of cells.

Biology & Microbiology

In an autosomal dominant disorder such as Huntington's, two heterozygous parents have the

probability of passing the gene on to ____ percent of their children. a. 50 b. 0 c. 100 d. 25 e. 75

Biology & Microbiology

Which of the following contribute to the surface area available for water absorption from the soil by a plant root system?

I) root hairs II) endodermis III) mycorrhizae IV) fibrous arrangement of the roots A) II and III B) I, III, and IV C) I, II, and IV D) I, II, III, and IV

Biology & Microbiology

Select the correct statements about MacConkey agar. (Check all that apply)

A.The lactose in MacConkey agar is inhibitory to Gram positive cocci. B.The selective ingredients in MacConkey agar are crystal violet and bile salts. C.The growth of Gram positive bacteria is inhibited on MacConkey agar. D.Most Gram negative bacilli grow well on MacConkey agar. E.The pH indicator in MacConkey agar is crystal violet. F.The differential ingredients in MacConkey agar include lactose and neutral red. G.Lactose-fermenting Gram negative bacilli will form pink-purple colonies on MacConkey agar.

Biology & Microbiology