The risk for Down syndrome increases ____

a. when the mother is over thirty-five years old
b. when the father is over thirty-five years old
c. when the father is over fifty years old
d. for dizygotic twins
e. for monozygotic twins


a

Biology & Microbiology

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Cytochromes contain a heme group similar to that in hemoglobin. The iron atom (Fe) in the center of the group can be oxidized and reduced. If someone was suffering from iron deficiency anemia, what stage of cellular respiration would be most affected?  

A.  Glycolysis B.  The Krebs cycle C.  The electron transport chain D.  Fermentation Clarify Question What is the key concept addressed by the question? What type of thinking is required?   Gather Content   What do you already know about redox reactions and when they take place during cellular respiration? What other information is related to the question?   Choose Answer Do you have all the information needed to determine which stage of cellular respiration would be most affected by an iron deficiency?   Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?  

Biology & Microbiology

The tropical diseases such as African sleeping sickness, Chagas disease, and leishmaniasis are caused by 

A. foraminifera. B. sporozoans. C. phytomastigotes. D. trypanosomes. E. oomycetes.

Biology & Microbiology

Which is not true of DNA replication?

a. It occurs in the S phase of the cell cycle. b. It functions similarly for all organisms. c. It is semiconservative. d. Both strands are synthesized in one direction only. e. Both strands are synthesized continuously.

Biology & Microbiology

The zoonosis (leptospirosis/trichomoniasis/vaginosis) is is acquired by skin contact and becomes a systemic infection

What will be an ideal response?

Biology & Microbiology