Protozoa are classified into four groups based on ________.
A. their required nutrients
B. the resistance properties of their cysts
C. their pathogenicity
D. how they move
Answer: D
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Behavior that is entirely controlled by genes and has no learning component is
(a) learned. (b) habituated. (c) instinctive. (d) classically conditioned.
Caenorhabditis elegans is a nematode that scientists have shown grows from a single cell into about 1000 cells, of which the same 80 cells die during development through apoptosis. Studying this process in Caenorhabditis elegans has helped scientists identify the genes that regulate similar processes in humans. Which of the following statements is supported by this observation?
A. Caenorhabditis elegans have all of the same genes as humans. B. Caenorhabditis elegans give live birth like humans. C. Caenorhabditis elegans and humans have a common ancestor. D. Caenorhabditis elegans infections in humans trigger apoptosis. E. Caenorhabditis elegans has the same organs that are present in humans.
If a cell containing 18 chromosomes divides by meiosis, how many chromosomes will each daughter cell have?
a. 2 b. 9 c. 18 d. 26
The site of gravity reception in roots is the:a
root apical meristem. b. periderm. c. root epidermis. d. root cap. e. root hair