Secondary metabolites are often useful, and are obtained by
A) harvesting a culture during log phase.
B) allowing a culture to enter stationary phase.
C) growing a culture at sub-optimal temperature.
D) adding chemicals that alter metabolic pathways.
E) using continuous flow culturing.
B
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Given the structure below, please answer the following questions
Is the accompanying figure DNA or RNA? ________ Is the arrow closest to the 5' or 3' end? ________ Spleen diesterase is an enzyme that breaks the covalent bond that connects the phosphate to the 5' carbon. Assume that the dinucleotide is digested with spleen diesterase. To which base and to which carbon on the sugar is the phosphate now attached, A or T? A) DNA; 3' end; T, 5' B) DNA; 5' end; A, 5' C) RNA; 3' end; A, 3' D) RNA; 3' end; T, 3' E) DNA; 3' end; A, 3'
A pregnant woman (first trimester) is concerned that she has been exposed to a chemical that blocks estrogen and progesterone receptors so that the body does not recognize these hormones
What is the most important reason she should be worried about this? A) GnRH may be inhibited. B) Luteinizing hormone (LH) may cause the release of another egg. C) Ovulation might occur. D) Menstruation may occur, thus causing the embryo or early fetus to be lost.
At the end of gastrulation, the ectoderm makes up the
A) lining of the embryonic digestive tract. B) outer layer of the gastrula. C) inner layer of the gastrula.
The ________ is the innermost layer of the eye that is lined with almost a quarter-billion photoreceptors
Fill in the blank(s) with correct word