A large groove that runs around the heart, and separates the atria from the ventricles is the
A. anterior interventricular septum.
B. posterior interventricular septum.
C. coronary sinus.
D. coronary sulcus.
E. cardiac fissure.
Ans: D. coronary sulcus.
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An individual tree can maintain a symbiotic relationship with many different species of mycorrhizae simultaneously
Indicate whether the statement is true or false.
DNA replication of a single DNA molecule is referred to as semiconservative because
a. it results in two nonidentical DNA molecules. b. one DNA strand is replicated continuously, while the other must be replicated discontinuously. c. of the two DNA molecules, one is made up totally of parental DNA, while the other is entirely newly synthesized DNA. d. all the DNA strands in the two DNA molecules will have both parental and newly synthesized DNA. e. each of the two DNA molecules will consist of one parental strand and one newly synthesized strand.
The hypothalamus and pituitary link the activities of the endocrine system and nervous system by
a. neurohormones being secreted in response to the summation of neural messages that enter the hypothalamus. b. shifts in hormonal concentrations being detected by the anterior pituitary. c. pheromones being secreted as a response to photoperiodic stimuli. d. the nervous tissue of the anterior lobe of the pituitary sending stimuli to the glandular tissue of the posterior pituitary to produce hormones that will be secreted by the hypothalamus. e. direct neural connections.
Which of the following is an example of evolution by artificial selection?
A. the migration of invasive species B. the evolution of different breeds of dog from ancestral wolves C. the evolution of feathers in the reptile ancestors of birds D. the evolution of antibiotic resistance in bacteria E. the evolution of larger beak size in the Galapagos finches