Which of the following is a characteristic of Bryophytes?
a. asexual reproduction with gemmae
b. true leaves
c. lignified tissue
d. true roots
Ans: a. asexual reproduction with gemmae
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A fragment of DNA with a radioactive label is incubated with DNase in the presence and absence of a protein that acts as a positive regulator of transcription. The samples are then run on a gel and visualized with autoradiography. Which statement describes a possible result and conclusion from such an experiment?
A) The banding pattern on the gel is the same with and without the transcriptional regulator, therefore the protein binds the DNA fragment. B) Some bands on the gel are absent in the sample with the transcriptional regulator, therefore the protein does not bind the DNA fragment. C) Some bands on the gel are absent in the sample with the transcriptional regulator, therefore the protein binds the DNA fragment. D) Some bands on the gel are absent in the sample without the transcriptional regulator, therefore the protein does not bind the DNA fragment.
Break down of the corpus luteum coincides
with a ____ levels if pregnancy does NOT occur. a. decline in chorionic gonadotropin b. decline in LH c. surge in progesterone d. spike in LH e. spike in extrogen
Photosynthesis occurs mostly in ________ cells.
A. Parenchyma B. Sclerenchyma C. Collenchyma D. Phloem
Children in the Southeastern United States play with red maple fruits (Acer rubrum). The fruits are tossed in the air and spin back to the ground, acting like small helicopters. Which part of the fruit allows for this?
A. The integument B. The endosperm C. The ovule D. The pericarp