What benefit do root hairs provide to the plant?
a. All of these choices
b. Increased nutrient absorbing ability
c. Increase in surface area of the root system
d. Increased water absorbing ability
e. None of these choices.
a
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All known species can be grouped into three
domains. What are they?
a. prokaryotes, bacteria, and eukarya. b. prokaryotes, archaea, and eukarya. c. plantae, bacteria, and archaea. d. bacteria, archaea, and eukarya. e. bacteria, archaea, and protista.
There is evidence that life existed about:a
3.5 billion years ago. b. 2 billion years ago. c. 1.3 billion years ago. d. 630 million years ago. e. 250 million years ago
Which statement best describes a lophophore?
A. It is a ciliated ring of tentacles surrounding the mouth. B. It is a larval stage found in the Lophotrochozoa and the Ecdysozoa. C. It is a structure used for locomotion in the Lophophorata. D. It is the opening also referred to as the anus in the Ecdysozoa. E. It is one of the openings to the excretory system of phylum Platyhelminthes
In active transport, what provides the energy needed to move ins or molecules across the membrane?
a. sodium & potassium ions b. calcium ions c. sodium ions alone d. ATP molecules