The resulting cell from the union of a male animal sex cell and a female animal sex called is called a(n)
A. gamete.
B. morula.
C. polar body.
D. zygote.
E. oogonium.
D. zygote.
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The attraction between Na+ cations and Cl? anions forms ____ that hold together the compound NaCl
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
Which statement about reptiles is true?
a. Scaly skin allows reptiles to live on land. b. Reptile eggs are fertilized externally. c. Reptiles generate their own heat. d. Reptiles have a two-stage life cycle.
DNA has no sulfur, and proteins have no phosphorus
Indicate whether the statement is true or false
The conjugation bridge in an Hfr × F? mating usually breaks before chromosome transfer is complete; however, because at least part of the plasmid is transferred first, the recipient becomes F+.
Answer the following statement true (T) or false (F)