The large central opening in the poriferan body is called the _____.
a) emmule
b) picule
c) stia
d) osculum
Ans: d) osculum
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When elemental sulfur is provided externally as an electron donor, the organism must attach itself to the sulfur particle because of the extreme insolubility of elemental sulfur
Indicate whether the statement is true or false.
Cytosine deamination is a common mutation that results in a cytosine being converted to a uracil. See Figure (a) below. During the processes of DNA repair and DNA replication, which of the following can occur?
Cytosine deamination can result in two different outcomes depending on the state of the cytosine. What will be an ideal response?
In the image above, the substance indicated as "C" is a(n) _____
a. inhibitor b. regulatory molecule c. substrate d. coenzyme e. cofactor
Which of the following is the best description of a gene?
A) a protein whose amino acid sequence is encoded in a segment of DNA B) A section of the nucleus where transcription takes place. C) a segment of mRNA that is translated into a protein D) a collection of millions or billions of base pairs of DNA, encoding many proteins E) a segment of DNA that is transcribed into an mRNA, a tRNA, or an rRNA