Which of the following is NOT characteristic of the phase of the cardiac cycle known as ventricular systole?
A) The atrioventricular valves close
B) Atria contract, causing blood to fill the ventricles
C) The ventricles contract
Answer: B) Atria contract, causing blood to fill the ventricles
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Choose the true statements about the evolution of eyes in mice and fruit flies.
_____ The gene Pax6 codes for a transcription factor involved in lens formation in the mouse. _____ In the fruit fly, the gene eyeless codes for a transcription factor involved in lens formation. _____ When the mouse gene Pax6 is inserted into a fruit fly, it causes a vertebrate-type lens to form on the fly's leg. _____ The sequences of the genes eyeless and Pax6 are very different.
Your study buddy is frustrated. "This book says that a single gene can make mice exhibit a certain behavior. That's ridiculous! How can you build any kind of neural circuit with just one gene?" What is your response?
A. "If the book says so it must be true. Ours is not to question why." B. "Some genes are longer than others, over 1000kb -- they have enough information to encode a full neural circuit." C. "Mice are a lot simpler than we are, and their brains are smaller. One gene is plenty for them to build a circuit." D. "What the book really means is: all else being equal, one variant of a gene is associated with higher levels of the behavior than the other variant of the gene. All the other thousands of genes are still needed to develop the brain. But variation in one gene can change how a certain neural circuit will behave."
Which of the following describes the composition of a nucleotide?
a. a five-carbon sugar, a phosphate group, and one of four amino acids b. a five-carbon sugar, a nitrogenous base, and one of twenty amino acids c. a five-carbon sugar, a phosphate group, and one of four nitrogenous bases d. a six-carbon sugar, a phosphate group, and one of twenty amino acids
Nematode worms and annelid worms share which of the following features?
A) a digestive tract with two openings (a mouth and an anus) B) molting C) presence of a circulatory system D) presence of segmentation E) absence of species with parasitic lifestyles