Genes for regulatory elements, such as creb, were found to be important in animal learning. Which of the following would increase the probability that such an element is studied throughout the animal kingdom?
A) its unique sequence in Drosophila
B) the finding that creb is highly conserved
C) the number of repeats of the creb gene
D) the interaction of creb with cAMP
E) the finding that creb activates odor perception
B
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Which intermediate compound(s) in the citric acid cycle is/are often used for biosynthetic pathways as well as carbon catabolism?
A) ?-ketoglutarate B) oxaloacetate C) succinyl-CoA D) ?-ketoglutarate, oxaloacetate, and succinyl-CoA
A scientist is studying a population of feral cats in his city. He notes that the r of this population is 1. What does this mean (assuming that he is evaluating population size on a yearly basis)?
A. that the population of feral cats doubles in size each year B. that the population of feral cats triples in size each year C. that the population of feral cats remains the same size from year to year D. that the population of feral cats decreases in size by 10% every year
Which of the following is not true of RNA synthesis by RNA polymerase?
A. RNA synthesis is less processive during elongation than during initiation. B. Synthesis begins with the polymerase binding two rNTP molecules. C. The polymerase frequently releases the nascent transcript before it reaches 8–10 nucleotides in length. D. The addition of an rNTP to a growing transcript is a magnesium ion-dependent reaction. E. All of the choices given are true.
As mussels and barnacles feed, how much of the energy that they take in from food is
available to the whelks that eat them?
a. 10 percent b. 90 percent c. 1000 calories d. 10,000 calories