Fossil evidence and other observations have enabled scientists to recognize several trends in hominid evolution. Which of the following trends appeared earliest in hominid evolution?
A) the ability to use language
B) the ability to make and use tools
C) an increase in the size of the teeth
D) the ability to walk upright on two legs
Ans: D) the ability to walk upright on two legs
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Sperm pass through several stages during their development. The earliest stage in which the cell
becomes haploid is the
a. sperm. b. spermatid. c. primary spermatocyte. d. secondary spermatocyte. e. spermatogonium.
Redwood trees are the tallest land plants that are members of the group known as conifers. Which of the following are features that are shared by all redwood trees?
A. Cell walls containing cellulose B. Leaves that have a cuticle C. Vascular tissue containing lignin D. Flowers E. Answers A and B F. Answers A, B, and C G. Answers A, B, C, and D
Protists in this group have a pellicle, and a light-sensitive organ called the stigma.
A. euglenoids B. dinoflagellates C. choanoflagellates D. foraminifera
When you have been bitten by a highly venomous snake and received a dose of venom sufficient to kill several people, you do not have a week to build up your own immunity. However, hospitals carry "antivenom" made from injecting horses with small-to-larger dosages of snake venom, and then harvesting the antibodies from the horse plasma. This is a case of
Select one: a. passive immunity. b. active immunity. c. developing an inflammatory response to increase the IgG production. d. high levels of complement. e. high levels of interferon.