Which of the following gymnosperms have pollen tubes with motile sperm?
a. cycads
b. ginkgoes
c. conifers
d. both a and b
e. a, b, and c
Ans: d. both a and b
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The presence of cytoplasmic membrane-bound organelles is characteristic of ____
a. Archaea only b. Bacteria only c. both Archaea and Bacteria d. neither Archaea nor Bacteria e. Achaea, Bacteria and Eukarya
In most animals with digestive tract, digestion occurs in four successive steps, with the digested material moving by
muscular contractions through the digestive tube.
Indicate whether the statement is true or false.What is the term for the sudden and involuntary contraction of a muscle?
a. spasm b. twitch c. tetanus d. treppe e. paralysis
The antibody active in agglutination or clumping of antigens is that determine blood groups. This antipody is a pentamer and it is found in the blood and the lymph.
A) IgA B) IgM C) IgG D) IgD