Identify two different types of contraception, one chemical and one physical. Discuss the mode of
action, effectiveness, advantages, and disadvantages of each method identified. What will be an ideal response?
Table 50-3 on textbook page 1099 provides a list of various contraceptive methods, their effectiveness,
and their advantages and disadvantages.
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Many zooplankton migrate daily from the DSL to the epipelagic zone
Indicate whether the statement is true or false
Cellular respiration
a. is the reverse of the process of photosynthesis. b. involves the physical exchange of gases. c. is a mechanism of tapping the energy found in the bonds between atoms in organic compounds. d. can occur only if there is a supply of glucose available because no other compound can be the energy source for cellular respiration. e. occurs only in animal cells.
When a region of DNA must be repaired by removing and replacing some of the nucleotides, what ensures that the new nucleotides are in the correct sequence?
A) DNA cannot be repaired and this explains why mutations occur. B) Specific enzymes bind the correct nucleotides. C) The new nucleotides base-pair accurately with those on the complementary strand. D) The repair enzyme recognizes the removed nucleotide and brings in an identical one to replace it. E) The three-dimensional structure determines the order of nucleotides.
In later chapters, you will learn more about the regulation of gene expression. One way to regulate gene expression is to make changes to the histone proteins to alter how tightly the DNA is coiled and wrapped. The more tightly coiled and wrapped a particular region of DNA is, the less likely it is that the genes in that region will be expressed. Bearing this in mind, how tightly do you think regions of heterochromatin are compacted?
A. loosely B. not at all C. very tightly D. moderately