Under what condition might a human female have the XY sex chromosome complement?
A) The X chromosome has a mutation such that it is able to overpower the Y chromosome.
B) The Y chromosome has an active Xist gene on it.
C) This is not possible.
D) This female would have one complete X chromosome and a Y chromosome that lacks SRY.
E) She has an XX chromosome and a Y chromosome.
Answer: D
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Stem cells (unspecialized cells) that develop into bone cells have undergone which type of process?
A. Involution B. Convergent extension C. Embryonic development D. Cellular differentiation E. Cellular respiration
In receptor-mediated endocytosis the proper sequence of event is:
a) primary lysosome exocytoses, digests food outside cell, food units absorbed by channels in plasma membrane. b) ligand-receptor binding, capping, fuse with endosome, secondary lysosome, digestion, absorption. c) capping, ligand-receptor binding, fuse with endosome, secondary lysosome, digestion, absorption. d) ligand-receptor binding, capping, secondary lysosome, digestion, absorption, tertiary lysosome. e) none of the above.
A plant cell lacking this structure cannot make carbohydrates and amino acids. What is that structure?
a. chromosomes b. chloroplast c. mitochondrion d. vacuole e. lysosomes
The probability of the immune system attacking a transplanted organ as opposed to transfused blood is higher.
Answer the following statement true (T) or false (F)