Cell differentiation accounts for cells of an organism
becoming different in
a. composition.
b. structure.
c. function.
d. development.
e. all of these.
Answer: e
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The shark rectal gland _____
A) is involved in osmoregulation B) is responsible for excretion of undigested residue C) secretes a hypotonic solution D) concentrates electrolytes necessary for homeostasis in a hypertonic environment
Which of the following events occurs during the first trimester of pregnancy?
A. The heart begins to form. B. The lungs fully mature. C. The fetus grows to 1 foot in length. D. The fetus has a very rapid phase of growth. E. All of these events occur during the first trimester.
If your mother and father both are healthy but carry the allele for cystic fibrosis, which is caused by a recessive allele,
the odds of you inheriting at least one allele for the disorder are ____.
a. 1/4 b. 1/2 c. 3/4 d. 1 e. 0
The vascular transport tubes of plants are reinforced with
a. cellulose. b. chitin. c. rhizoids. d. mycorrhizae. e. lignin.