A pine seed is composed primarily of
a. the embryo.
b. female gametophyte.
c. seed coats.
d. the embryo and seed coats.
e. the embryo, seed coats, and female
gametophyte
E
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How do lycophytes differ from bryophytes?
A. Lycophytes have tracheids. B. Lycophytes produce seeds. C. Lycophytes use flowers for reproduction. D. The dominant stage in a lycophyte is the gametophyte.
Antibiotics kill bacterial cells but do not (usually) damage human cells by taking advantage of the difference between human and bacterial cells. These differences include
A) bacterial cells have cell walls, human cells do not. B) bacterial ribosomes are larger than those of humans. C) protein synthesis in bacteria is identical to that in human cells. D) bacterial cells have a cell membrane, human cells do not. E) human and bacterial DNA are enclosed in a nucleus.
Answer the following questions true (T) or false (F)
1. Transport proteins are integral plasma membrane proteins. 2. Some integral proteins can span the entire phospholipid bilayer. 3. The functioning of the immune system depends on recognition proteins.
An Italian physician, ________, challenged the concept of spontaneous generation by demonstrating that maggots do not arise from decaying meat but rather from developing fly eggs.
Fill in the blank(s) with the appropriate word(s).