All organ systems in a human embryo have
formed by ___.
a. week eight.
b. the 5th day.
c. week 5.
d. week 6.
e. the eighth month.
A
You might also like to view...
Theodore Diner was researching which of the
following plant diseases when he discovered the first viroid? Chapter 21 Viruses and Prokaryotes 3 a. potato spindle tuber disease b. tulip variegation c. tomato root rot d. chestnut blight e. all of the above
If a person is treated with a single anti-HIV drug, they often end up with a resistant strain. How does this occur?
a. The drugs weaken the immune system, making a patient more susceptible to infection with resistant strains of HIV b. The drug causes mutations in the HIV, making them resistant to the drug c. The drugs kill all sensitive viruses, leaving only the pre-existing resistant viruses d. The HIV wants to avoid the drug, so it becomes resistant
During molecular cloning, a gene of interest (insulin) is inserted into a bacterial structure called a ________ and enters a bacterial cell through a process called ________
A) chromosome; electrophoresis B) nucleus; transformation C) plasmid; transcription D) plasmid; transformation E) genome; transformation
Small pieces of RNA that can regulate translation of mRNA are called
A) microRNA. B) ribosomal RNA. C) transfer RNA. D) messenger RNA.