What enzyme separates strands of DNA during DNA replication to make DNA single- stranded so it can be copied?
A) DNA primase
B) DNA polymerase
C) DNA helicase
D) DNA ligase
E) Reverse transcriptase
C
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Which of the following organisms has the largest number of protein-coding genes?
a. E. coli (bacteria) b. Saccharomyces cerevisiae (yeast) c. Homo sapiens (human) d. Oryza sativa (rice) e. Drosophila melanogaster (fruit fly)
Which male reproductive structure is “snipped” during a vasectomy?
1.epididymis
2.vas deferens
3.seminal vesicle
4.urethra
A disease that has a steady frequency over time in a particular geographic location is referred to as ________.
A. endemic B. chronic C. pandemic D. sporadic E. epidemic
In the 1700s, a system was developed for naming plants and animals and grouping similar organisms together. What is such a system called?
a taxonomic system a life categories system a descriptive grouping system a phylogeny system