Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis, the Citric acid cycle and electron transport. Your best advice would be to
A. follow NAD+ production.
B. follow the protons.
C. follow the electrons.
D. follow ATP production.
Answer: C
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The primary RNA transcript in eukaryotes is
A. mRNA before the exons have been removed. B. tRNA before it forms its hairpin loops. C. mRNA after the introns have been removed. D. rRNA before it forms the ribosome. E. mRNA before the introns have been removed.
Before mRNA can be used in translation (the making of a new protein), nonfunctional segments of the gene that have been transcribed into the strand of pre-mRNA have to be "edited" out. The nonfunctional parts of the gene are cut out (and the functional parts spliced together) by a special type of enzyme. What are these enzymes called?
a) introns b) exons c) genomes d) snRNPs ("snurps") e) polyribosomes
Which of the following statements about internal membranes in eukaryotic cells is false?
A) In eukaryotic cells, internal membranes greatly increase a cell's total membrane area. B) In eukaryotic cells, internal membranes provide an additional area for many metabolic processes to occur. C) In eukaryotic cells, internal membranes form membranous compartments called organelles. D) In eukaryotic cells, internal membranes standardize the internal environment of all cellular organelles.
New mothers may benefit from the aid of lactation consultants when learning to breastfeed. These consultants give advice on technique, and help the mother to feel relaxed and confident. What hormone is associated with calm, warm emotions and is also critical for the milk let-down reflex?
A. prolactin B. estradiol C. oxytocin D. mammotropin