Which of the following are not used by protists for protection against predators?
A. protective coverings that are hard, tough, or slimy
B. toxins
C. shooting acids
D. sharp projectiles
E. flashing lights
C. shooting acids
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For a typical flowering plant, the first cell of the triploid (3n) endosperm is formed from ____
a. one sperm fused with two antipodal cells b. two sperm fused with the egg c. one sperm fused with the synergid d. one sperm fused with the endosperm mother cell e. two sperm fused with a synergid
mRNA regulation can be achieved at the level of
A) transport. B) processing. C) translation. D) life span (degradation). E) All of these
Many species of birds form large flocks. What dispersion pattern describes this behavior?
A. random B. clumped C. social D. uniform E. rapid
Which of the following statements is false regarding mammals?
A. Mammals’ lower jaw consists of a single bone. B. Mammals have distinctive skeletal and dental traits. C. The mammalian heart is three-chambered. D. Mammals are animals in which females nourish their offspring with milk that they secrete from mammary glands. E. Mammals also include the only animals that sweat.