One possible reason for the lack of a nucleus in sieve-tube cells may be that the nucleus would:
A. impede bulk flow
B. cause the cell to die
C. pass through the plasmodesmata and disrupt bulk flow
D. cause the cell plate not to form
E. interfere with bulk flow in the xylem
A. impede bulk flow
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Assuming some bacteria did enter her body, an example of the second line of defense against
these bacteria includes __________.
a. phagocytes b. mucus c. macrophages d. antibodies
Individuals who are homozygous recessive for cystic fibrosis suffer from what defect?
1.inability to form Barr Bodies 2.altered hemoglobin molecules 3.altered membrane proteins 4.inability to convert phenylalanine to tyrosine 5.loss of chromosome tips
A couple has already had 3 girls with cystic fibrosis, and were hoping to have a normal child for their
fourth. What are the chances that the fourth child will be a normal male? a. 0 b. 1/8 c. 1/4 d. 3/8 e. 1/2
An embryo was exposed to a chemical early in its development. At birth, there is chromosomal damage to the circulatory system linked to the chemical exposure. What other organ systems should be examined for the same type of damage?
What will be an ideal response?