Which part of an antibody molecule contains the variable regions of a heavy and light chain that fold into a groove that will interact directly with and bind to a specific antigen?
A. disulfide bonds
B. Fc end
C. Fab ends
D. light chains
E. heavy chains
Answer: C
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C. hyperpolarized, decreases Upon emerging from a darkened area like a movie theater during daylight, our eyes are initially extremely sensitive to light. This is because
A. our pupils are wide open and take some time to close. B. the proportion of our retinal in the cis- conformation is high. C. the proportion of our retinal in the trans- conformation is high. D. our rods and cones are already highly hyperpolarized from the previous dark conditions. E. All of the answers are correct.
In placental mammals, such as humans, the dosage compensation mechanism to equalize expression of sex-linked
genes in males and females involves ____.
a. doubling the gene expression for most genes on the X chromosome in males b. doubling the number of X chromosomes in males during embryonic development c. having all major genes on the X chromosome also present on the Y chromosome d. halving the gene expression for most genes on each X chromosome in females e. inactivating one of the two X chromosomes in most female somatic cells
Which amoebozoan spends most of their life cycle as a multinucleated mass that streams along surfaces, feeding on microbes and organic matter?
a. all slime molds b. cellular slime molds c. plasmodial slime molds d. amoebas e. spore-bearing fruiting bodies
Which of the following technologies allowed marine biologists to descend below the surface and observe marine organisms in their environment?
A) Sound Navigation Ranging SONAR B) The Chronometer C) Self-Contained Underwater Breathing Apparatus D) Floating Instrument Platform FLIP