What organ has capillaries that are the most restrictive to movement of hydrophilic solutes?
A) skeletal muscle
B) kidneys
C) brain
D) liver
E) bone marrow
Answer: C) brain
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We have a family of genes that code for different forms of myosin. Where in the sequence would you expect to see differences among these genes?
A. regulatory region only B. product coding region only C. regulatory and/or product coding regions D. no difference in any aspect of the gene sequence
In the Hardy-Weinberg equation, p + q =_______, where p and q represent _________.
A. 0, allele frequencies B. 1, genotype frequencies C. 2, allele frequencies D. 2, genotype frequencies E. 1, allele frequencies
A recent study of the effects of the general anesthetic isoflurane suggests that it has a direct
impact on an organism’s biological clock. This study focused on honeybees because their clock genes are similar to those found in mammals. Prior to the start of this study, bees were trained to fly to an artificial flower to obtain sugar water and then return to the hive. In this study, researchers caught the bees as they approached the artificial flower. Half of the bees were anesthetized, and the other half were contained and not allowed to return to the hive immediately. After six hours, when all the anesthetized bees had awoken, both groups of bees were released. Honeybees use the sun to navigate, and their biological clock allows them to correct for the time of day. The bees that were not anesthetized flew directly to the hive, making adjustments for the time of day. However, those that were anesthetized made adjustments as if the time were hours earlier and flew at the wrong angle. Doctors report that people often emerge from general anesthesia disoriented in time and may sleep fitfully for a while afterward. Based on the honeybee study, researchers are looking into ways to keep the internal clock ticking normally even during surgery.
In a natural system, honeybees as well as the flowers they feed on and pollinate would be considered a(n)
a. ecosystem. b. population. c. community. d. organ system.
Which of the following is FALSE for the electrical synapse?
What will be an ideal response?