What is NOT a characteristic of radiolarians?
a. They have perforated shells of calcium carbonate.
b. They form part of the plankton.
c. They use pseudopods for feeding.
d. They have vacuoles that impart buoyancy.
e. They are heterotrophic protists.
ANSWER: a
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Hemophilia A is an X-linked recessive genetic condition. In humans it is due to a mutation in the F8 gene, which encodes a protein called coagulation factor VII. Coagulation factors are proteins important in blood clotting. Individuals with hemophilia, when injured, bleed longer than a normal, healthy individual; the inability to normally clot blood can be life threatening. Hemophilia is much more common in males than in females. Which of the following does NOT explain why this is so?
A. A female with one defective allele makes enough normal coagulation factor VII to clot blood and will not have hemophilia A B. Males are hemizygous for the F8 gene, so they will have hemophilia A if they have one defective allele C. Females have to receive a defective allele from both their mother and their father to get hemophilia A D. Males have to receive a defective allele only from their father to get hemophilia A
Disease/s caused by Streptococcus pneumoniae include ________.
A. meningitis B. otitis media C. lobar pneumonia D. bronchial pneumonia E. All of the choices are correct.
In birds and mammals, a vestige of the sinus venosus of the fish heart remains as the sinoatrial node, which serves as a(n)
A. pacemaker. B. inhibitory node. C. diastole detector. D. site of erythropoiesis. E. baroreceptor.
Which choice below correctly matches organelle with function?
A) smooth endoplasmic reticulum–lipid production B) lysosome–energy generation C) cytoskeleton–recycling of materials D) mitochondria–food generation