Spermatids are indicated by
a. A.
b. B.
c. C.
d. D.
e. C and D.
Answer: e
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What do the results of research on gravitropic responses of roots and stems show?
A) Different tissues have the same response to auxin. B) The effect of a plant hormone can depend on the tissue. C) Some responses of plants require no hormones at all. D) Light is required for the gravitropic response. E) Cytokinin can only function in the presence of auxin.
Why are telomeres important?
a. They keep track of the number of cell divisions that a cell undergoes. b. They provide extra nucleotides when needed during replication. c. They are needed for histone and DNA arrangement. d. They provide a site of attachment for spindles in cell division. e. They provide a buffer against the loss of more valuable DNA.
Sometimes when I have my morning coffee, which I drink black with no cream or sugar, I notice a thin film floating on top of the coffee
Since I have just read Chapter 3 of the text, I now realize the nature of this substance and so I run to my friend screaming, "Look at this ________ in my coffee!" A) hydrophilic substance B) hydrophobic substance C) disaccharide D) polysaccharide
The graph below shows the extinction rates for different periods of Earth's history. What is the best estimate for the background extinction rate given these data?
a. 14–20 families per million years c. 2–5 families per million years b. 8–12 families per million years d. 2–20 families per million years