Which of the following accurately states the goal of biological classification?
a) the acknowledgement that ancestral eukaryotes gave rise to ancestral bacteria and archaeans
b) a way to include all biological entities, including viruses, in the tree of life
c) the separation of all organisms into four separate kingdoms
d) the grouping of organisms into categories that reflects their evolutionary history
e) the grouping of organisms into three large polyphyletic categories
Ans: d) the grouping of organisms into categories that reflects their evolutionary history
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Answer the following statements true (T) or false (F)
1. Restriction enzymes bind to specific sequences of DNA to seal them together. 2. Most plasmids used in biotechnology contain a selectable marker such as an antibiotic-resistance (ampR) gene. 3. A DNA library is known as a genomic library when it is derived from mRNA. 4. If a large protein is run on a gel slab and subjected to electrophoresis, one would expect to find its band towards the top of the gel.
Which of the following geographical areas
offers the most suitable environment for development of life?
a. tropical regions b. temperate regions c. desert regions d. equatorial regions e. polar regions
Erica, a 17-year-old female, is a member of her high school swim team. She visits her physician because she has missed her last two menstrual periods. Laboratory tests are negative for HCG. Based on this limited information, speculate about the cause of Erica’s amenorrhea. What treatment, if any, would you recommend?
What will be an ideal response?
In order to reproduce sexually, diploid cells must produce ________ gametes through ________.
A. haploid; mitosis B. triploid; mitosis C. haploid; meiosis D. diploid; meiosis E. diploid; mitosis