Which of the following statements about the behavioral effects governed by forS and forR in Drosophila is not correct?
A. The for gene encodes a cGMP-dependent
protein kinase.
B. This enzyme phosphorylates target
proteins in the brain and affects neuronal
activity.
C. In the absence of food, both sitters and
rovers move about in search of food.
D. In the presence of food, sitters remain
stationary and eat, whereas the rovers move
all around the food and eat.
E. The sitters usually become obese due to
their stationary foraging behavior.
E
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Corticosteroids will
A. reverse spasms of respiratory smooth muscles. B. inhibit the activity of lymphocytes. C. block synthesis of leukotrienes. D. bind to histamine receptors on target organs.
When the first example of a duckbilled platypus was presented for identification, the scientists that received the specimen tried to remove all of its pieces and parts to prove it had been contrived. Indeed, it is an odd creature seemingly made up of spare parts from various classes of animals. The bill of the platypus is not related to the bill of a duck though they seem so similar and evolved to solve a similar environmental pressure (accessing food while in the water). What do we call structures like these bills?
a. homologous b. vestigial c. analogous d. phylogenetic
Constructing a pedigree is useful when studying inheritance patterns in organisms that _____
a. produce many offspring per generation b. produce few offspring per generation c. have a very large chromosome number d. reproduce sexually e. have a fast life cycle
Select all of the following that are true of the intrinsic rate of population growth.
A. It is not often seen in nature. B. It is the rate of population growth once a population reaches its carrying capacity. C. It is the rate of population growth under optimal conditions. D. It is seen when populations are in equilibrium. E. It is most commonly seen in new, expanding populations.