The primary role of the two sperm produced in the germ tube of the pollen is to
A. release proteins for germination
B. aid the plant's seed production
C. ensure that there will be fertilization of the egg and the two central cells
D. ensure production of an embryo
E. allow the endosperm to become a seed
C. ensure that there will be fertilization of the egg and the two central cells
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Which amino acid can be involved in special covalent "disulfide bridges" that, when present, help to stabilize the
tertiary and quaternary structure of proteins?
a. proline b. alanine c. leucine d. cysteine e. methionine
We consider the crash of the groundfish populations off the coast of Cape Cod as an example of ecosystem collapse due to mankind's negligence. How might this forecast our future?
What will be an ideal response?
Acne results when
a. bacterial secretions from hair follicles leak into internal tissues. b. bacteria that cause acne burrow into open skin wounds. c. bacterial secretions are swallowed and become systemic. d. bacterial secretions mix with sweat and become more acidic. e. bacteria are phagocytized by macrophages which then become hyperactive
A gene that when mutated leads to organisms with structures in abnormal places is termed
A. Dominant B. Homologous C. Parsimonious D. Vestigial E. Homeotic