Leaching is most likely to affect the nutrients plants need in which soil horizon?
A. Bedrock
B. Subsoil
C. Topsoil
D. Soil base
C. Topsoil
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Carbon dioxide in the atmosphere absorbs heat energy and emits it in all directions, making it a ____
Fill in the blank with the appropriate word.
DNA ligase closes nicks between ____ by forming ____ bonds
a. nitrogenous bases; hydrogen b. RNA fragments; noncovalent c. DNA and RNA fragments; covalent d. DNA fragments; peptide e. DNA fragments; covalent
Answer the following statements true (T) or false (F)
1) Two genes are considered linked when there are more F2 progeny with recombinant genotypes than parental genotypes in the offspring of a dihybrid testcross. 2) Chiasmata are structures that show where recombination occurred between sister chromatids. 3) Chiasmata can be seen through a light microscope and are sites of recombination. 4) A linkage group includes all of the genes on a chromosome, including genes that are so far apart from each other on a chromosome that they assort independently during meiosis. 5) The hypothesis that predicts no linkage between genes is known as the null hypothesis.
No prokaryotic cells have
a. ribosomes. b. a nucleus. c. cytoplasm. d. a plasma membrane. e. cell walls