In which phase of meiosis does the chromosomal alignment tke place?
A) Prophase I
B) Prophase II
C) Metaphase I
D) Metaphase II
Ans: C) Metaphase I
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What is the key difference between choanoflagellates and sponges?
a) Choanoflagellates are strictly aquatic. b) Sponges are multicellular c) Sponges are assymetrical and do not have tissues d) Choanoflagellates have distinctive flagellated cells that function in suspension feeding.
You have discovered a very small amount of DNA from an ancient organism that you want to save and study. What is the very first thing you should do to allow you to study this DNA in the lab?
A. RT-PCR B. Gel electrophoresis C. Polymerase chain reaction (PCR) D. Insert the DNA into a vector Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about DNA techniques? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
If pollen of one species of plant lands on the stigma from another species, then ________
a. it binds but does not germinate b. a hybrid plant is produced that may or may not survive c. it germinates but the sperm will not fertilize the egg d. it does not bind because it lacks the proper recognition proteins
When a land bridge connecting two continents
is cut off due to rising sea levels, this can lead to
a. sympatric speciation. b. disruptive selection. c. directional selection. d. hybrid sterility. e. allopatric speciation