One of the first steps in obtaining a kayrotype is treating cells wiht a drug that stalls cells in mitosis. Why must cells arrest in mitosis for karyotype analysis?
A.) only in mitosis are homologous chromosomes paired up
B.) only mitotic chromosomes are highly condensed and visible with a light microscope
C.) only mitotic cells contain homologous chromosomes, because mitosis happens after DNA
D.) only mitotic chromosome DNA is separated into single strands, allowing for stained by dyes
Ans: B.) only mitotic chromosomes are highly condensed and visible with a light microscope
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All of the following are true of every cell of
the early human embryo EXCEPT that a. each has the same genes as all the others. b. each can give rise to an entire human. c. they are undifferentiated. d. all will differentiate alike. e. all have maternal messages
The stage of cellular respiration in which most of the ATP is produced is the citric acid cycle
__________________ Indicate whether the statement is true or false.
Your classmate is trying to keep all the facts about biological molecules straight. He asks you to explain how amino acids and proteins are related. What do you tell him?
A) Amino acids are formed by joining together many proteins. B) Proteins are chains of carbohydrates, and amino acids are a type of lipid. C) Proteins are made up of chains of amino acids. D) Proteins are a portion of an amino acid.
A relationship between the developing embryo and mother in which the eggs are fertilized internally and then deposited outside the mother's body to complete their development is called
A. external fertilization. B. ovoviviparity. C. oviparity. D. viviparity.