Protection of the embryo is a major requirement for land plants given there is no aquatic environment in which to keep it safe from desiccation and other environmental hazards. Which structure, in both seed and seedless plants, provides the protection and nutrients needed by the embryo as it develops?
a. sporangium
b. gametangia
c. female gametophyte
d. archegonium
c. female gametophyte
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A plant cell with a ?P ? 0.2 MPa maintains a constant volume when bathed in a solution that has a ?S ???0.2 MPa
and is in an open container. What do you know about the cell?
a. The cell has a ?S ? 0.4 MPa. b. The cell has a ?S ???0.2 MPa. c. The cell has a ?S ???0.4 MPa. d. The cell has a?????0.4 MPa. e. The cell has a??? 0.2 MPa
Which scientist(s) discovered the basis for the base-pair rule, which states that the amounts of thymine and adenine are
always equal in all DNA molecules, as are the amounts of cytosine and guanine?
a. Watson and Crick b. Beadles c. Chargaff d. Franklin e. Pauling
The quick response of the immune system to a second infection is due to
A. activation of macrophage cells. B. suppression of suppressor cells. C. T and B memory cells. D. high levels of antigen. E. new cytotoxic T cells.
List the functions of the skeletal muscles.
What will be an ideal response?