Fetal hemoglobin carries ________ percent more oxygen than adult hemoglobin.

A) 5 to 10

B) 20 to 30

C) 50 to 60

D) 80 to 90


B) 20 to 30

Biology & Microbiology

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Which vessel, A, B, C, or D, carries blood to the human lungs?

1.A 2.B 3.C 4.D

Biology & Microbiology

On human chromosome 11 there is a gene called DRD4. This gene carries the instructions for building a protein that is receptor for the brain chemical dopamine. There are two different alleles, C and T. Subjects in a study (with known DRD4 genotypes) responded to a questionnaire on temperament and character. Based on the graph shown above, what conclusion might you draw about an individual with two C alleles?

What will be an ideal response?

Biology & Microbiology

Identify the two systems that work together to control our internal organs.

A. endocrine system B. integumentary system C. nervous system D. cardiovascular system

Biology & Microbiology

Use your knowledge of photosynthesis and cellular respiration to explain why maintaining a healthy greenhouse is necessary for the long-term survival of the Mars Colony.

Also explain why the humans are just as crucial to the greenhouse.

Biology & Microbiology