Which of the following has eggs that do not require a moist environment to complete development?
a. Salamander
b. Frog
c. Toad
d. Cecilia
e. None of the listed responses are correct.
Answer: e. None of the listed responses are correct.
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CD4 molecules are found on T ________ cells, whereas CD8 molecules are characteristic of T________ cells.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements is false?
a. Chromosomes do not pair during mitosis. b. Genes and chromosomes are duplicated during prophase. c. Each species has a specific number of chromosomes. d. New nuclei are formed during telophase. e. A diploid cell will produce two diploid daughter cells by mitosis.
When separating DNA fragments by gel electrophoresis, what is the purpose of including molecular weight markers?
A. Markers provide an indication as to the total number of restriction fragments on the gel. B. Markers are used as a control to determine the relative size of restriction fragments. C. Markers are needed to estimate the relative charges on each of the restriction fragments. D. Markers ensure that fragments having a greater molecular weight migrate at the same rate as those having a lighter molecular weight.
Describe the pathway that a drop of water would go through starting at the root system and leaving at the leaf. Be sure to indicate the various tissue types that the water will come in contact with along its pathway.
What will be an ideal response?