Sickle cell is a codominant disease, meaning that heterozygotes exhibit an intermediate blood cell phenotype (a mixture of normal and sickle cells) due to the blend of hemoglobin tetramers in each red blood cell
Which of the following tetramer structures would you expect to find in a carrier of SCD? A) ?2?A2
B) ?2?S?A
C) ?2?S2
D) ?2?A2 and ?2?S?A
E) ?2?A2 and ?2?S?A and ?2?S2
E
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Why do people tend to get shorter as they age?
a. they hunch over due to fatigue b. their bones become shorter c. their muscles become shorter d. the intervertebral disks deteriorate e. the vertebral height diminishes
A given enzyme
a. can be used for many different kinds of chemical reactions. b. is permanently changed during a chemical reaction. c. has a special site where the products bind before the reaction begins. d. increases the rate of a particular reaction.
The staggering of the collagen trimmers gives the fibrils a striated appearance in the electron microscope.
a. true b. false
Which group of algae seems to straddle the boundary between algae and protozoans?
A) Euglenozoa B) Rhodophyceae C) Alveolata