In the pine life cycle
A. the cone is the fruit that surrounds the seeds.
B. fertilization occurs shortly after pollination to produce the zygote.
C. the gametophyte generation is dominant and the sporophyte generation is inconspicuous.
D. seed cones are located near the tips of higher branches and pollen cones develop near the tips of lower branches.
E. seed cones are smaller than pollen cones.
Answer: D
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Identify the structure indicated by #4:
A. uterus B. cervix C. vagina D. ovary E. fallopian tube or oviduct
The mouse is a particularly useful model for studying human disease because _____
a. mice and humans are 100% genetically identical b. all mice are in essence, clones c. mice do not feel pain and discomfort d. mice and humans are the only species whose genomes have been sequenced e. approximately 90% of human disease-associated genes are present in the mouse genome
Each cell is able to maintain a constant internal
environment. This condition is called a. metabolism. b. homeostasis. c. physiology. d. adaptation. e. evolution
Respond to statements 117–121 in reference to the five items
listed below. a. antigens b. antibodies c. helper T cells d. cytotoxic T cells e. effector B cells E 117. These bind, as in a lock-and-key mechanism, to foreign proteins. D 118. These produce immunoglobulins in response to the reinvasion by a virus. D 119. These directly attack the foreign cells of an incompatible skin graft. M 120. An Rh+ molecule in the body of an Rh woman is an example of these. D 121. Proteins produced by these attack bacteria and viruses in the blood.