Answer the following statements true (T) or false (F)
1.Veins are the vascular bundles inside of a leaf.
2.Root hairs increase the absorptive surface area of a root.
3.In woody plants, the vascular cambium produces xylem and the cork cambium produces phloem.
4.Chemicals that are vital to the metabolism, growth, and reproduction of plants are called essential elements.
5.Carbon, hydrogen, and oxygen only account for about 50% of the dry weight of a plant.
1.TRUE
2.TRUE
3.FALSE
4.TRUE
5.FALSE
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In humans, having dimples in the cheeks is a dominant trait. If a child has dimples but only one of her parents does, what are the genotypes of her parents? (D = dimples; d = no dimples)
A. One parent dd, other parent DD B. One parent dd, other parent Dd C. One parent Dd, other parent DD D. One parent must be DD, the other parent could be either dd or Dd E. One parent must be dd, the other parent could be either Dd or DD
Which of the following parasites is the major parasitic cause of deaths worldwide, yet its transmission could be prevented by access to clean water?
A. Cryptosporidium parvum B. Giardia intestinalis C. Cyclospora cayetanensis D. Entamoeba histolytica
How many years is the average life span of a species on Earth?
A) 1000 B) 100,000 C) 1 million D) 100 million
Complement activation results in ALL of the following EXCEPT
a. membrane lysis. b. antibody production. c. lysis of target cell. d. enhanced phagocytosis.