Chlamydomonas is unicellular and photosynthetic. Chlamydomonas is which of the following?
A. a slime mold
B. an apicomplexan
C. an amoeba
D. a protozoan
E. a green alga
Answer: E. a green alga
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Undifferentiated cells of plants are most likely to be present in which of the following tissues?
A. leaves B. transport systems (xylem and phloem) C. root tips D. flowers
Steroid hormones are lipids derived from ___________________. Fill in the blank(s) with the appropriate word(s)
Carbon dioxide is required in the light reactions of photosynthesis
Indicate whether the statement is true or false
The following experiment is hypothetical. Meselson and Stahl labeled DNA with the heavy N15 isotope of nitrogen, then allowed the DNA to go through one round of replication in the presence of the light N14 isotope. After analyzing the resulting double stranded DNA helices in a CsCl density gradient they observed two bands of DNA in the gradient. One band was found in a position expected for DNA that had only the light N14 isotope, while the other band was found at the heavy N15 position. These observations are consistent with which mode of DNA replication?
a. dispersive replication b. conservative replication c. dispersive or semi-conservative replication d. semi-conservative replication