Which statement is true?
a. broadcast spawning produces a high percentage of surviving eggs
b. broadcast spawners participate in elaborate courtship behaviors
c. the offspring of broadcast spawners are vulnerable to predators
d. broadcast spawning requires organisms to travel long distances
c. the offspring of broadcast spawners are vulnerable to predators
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According to the latest research, what statement best describes the first eukaryote?
a. It lacked a nucleus, a mitochondrion, or a chloroplast. b. It lacked a nucleus, but contained a mitochondrion and a chloroplast. c. It contained a nucleus and a chloroplast, but not a mitochondrion. d. It contained a nucleus and a mitochondrion, but not a chloroplast. e. It contained a nucleus, a mitochondrion, and a chloroplast.
The wood duck shown in the above photograph was adversely affected by ____ and is making a comeback thanks to
____. a. global cooling; heat producing chemical added to their diet b. sexually transmitted viruses; a new vaccine c. limited numbers of natural cavities; artificial nesting boxes d. high incidence of males being born; transplantation of females from other areas e. invasive species; removal of introduced predators
Chromosome painting is a relatively new technique in karyotype analysis. Which one of the following
statements about chromosome painting is false? A. It is done to make abnormalities easier to detect. B. The dyes used to create color are fluorescent dyes. C. The dyes are attached to DNA sequences. D. In a normal karyotype, each chromosome appears with bands of different colors. E. Each of the 24 different chromosome types has a unique appearance.
Why are enzymes important to biological systems?
a. Enzymes are reuseable. b. Enzymes prevent unwanted chemical by-products from forming. c. Enzymes increase the energy barrier required of chemical reactions. d. Enzymes decrease the amount of activation energy required for chemical reactions to occur.