A zygote with animal and vegetal poles demonstrates what characteristic of some animal zygotes?
What will be an ideal response?
polarity
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Which of the following is not true of human immunodeficiency virus (HIV)?
A. It is the causative agent of acquired immune deficiency syndrome (AIDS). B. It targets the B cells of the immune system. C. It binds to the cell surface receptor CD4. D. It kills many of the cells it infects but can integrate into the host genome. E. It has the most error-prone of all reverse transcriptases, which results in a high mutation rate.
Where would the oocyte most likely be when it completes meiosis?
1.in the ovary 2.in the uterus 3.in the oviduct 4.in the vagina
If Mendel had not examined the __________
generation, he would not have discovered his theory of segregation. a. P1 b. H1 c. A1 d. F1 e. F2
The structures labeled 2 in Figure 43-2 are the:
a. ampullae.
b. cochleae.
c. utricles.
d. semicircular canals.
e. bony labyrinth