What structure in an interphase eukaryotic cell is the site of ribosomal RNA transcription?
A. nucleolus
B. nuclear lamina
C. nucleosome
D. ribosome
Ans: A. nucleolus
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____ is the process by which the nuclei within a heterokaryotic fungal cell fuse
Fill in the blank with the appropriate word.
If you could speed up the process of continental drift in order to witness its effects over the next 1 million years, what factors do you think would be affected? Check all that apply.
_____ Ocean circulation patterns _____ Global climate patterns _____ The number of extant (living) species _____ The distribution of extant species _____ The intensity of solar radiation at different latitudes
The placenta ____
a. forms from endometrial and extraembryonic tissues b. will cover about one-half of the inner uterine surface at full term c. intermingles fetal blood with maternal blood d. secretes only estrogen to maintain the uterine lining during the second and third trimesters e. secretes only progesterone to maintain the uterine lining during the second and third trimesters
A segment of DNA that specifies a sequence of amino acids in a polypeptide is called a(n) ____________.
A. codon B. intron C. messenger D. gene E. enzyme