The chemical bonds that are formed when atoms share electrons unequally are called ____
a. polar covalent bonds
b. van der Waals forces
c. ionic bonds
d. hydrogen bonds
e. nonpolar covalent bonds
A
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Which one of the following occurs when a phosphate is removed from an ATP molecule?
A) Energy is added to the ATP molecule to form ADP. B) Oxygen produced in the reaction causes the molecule to explode. C) Energy is released for cell work. D) Chemical reactions stop in a cell due to lack of an energy source. E) Fat is converted to protein.
A healthy male will release ____ sperms during one ejaculation.
A. 300 B. 3,000 C. 30,000 D. 300,000,000
Why does sexual reproduction produce more genetic variability in a population?
a)Offspring are genetically identical to one parent. b)During sex, adults can exchange genetic material thus increasing their variability. c)Organisms arising from sexual reproduction can change their genetic material in response to environmental changes. d)Sexually-reproducing organisms mutate more rapidly than asexually reproducing organisms. e)Offspring are a genetic mix of both parents.
Diatoms
A) are autotrophs with a glassy cell wall that contains silica. B) are mixotrophs. C) are heterotrophic protists that decompose dead plants and animals in freshwater habitats. D) include the malaria parasite.