Aquaporins are proteins that control the passage of water molecules across a cell membrane. The protein forms a pore, or opening, in the membrane. You isolate what you think are two different molecules of aquaporin
, and determine that one of the proteins has a larger pore diameter than the second. Which of the following do you conclude?
A) These two forms of aquaporin will have identical sequences of amino acids.
B) These two forms of aquaporin will have different sequences of amino acids.
C) You will have to sequence the proteins to compare their primary structure, because it should have no effect on pore diameter.
D) These two forms of aquaporin have identical primary structure but differ in their tertiary structure.
Answer: B
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The yeast in the image below are budding into haploid cells. What molecule have they most likely begun to secrete?
a. luciferase
b. autoinducer
c. mating factor
d. tyrosine kinase
Answer the following statement(s) true (T) or false (F)
1. True or False: An r-selected species is more likely to become an invasive pest than a K-selected species. 2. Interspecific competition can affect the phenotypic characteristics of organisms. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about interspecific competition? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result? 3. Geographical allopatry between species is definitive evidence of interspecific competition. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about interspecific competition and the contribution that geographic allopatry might have in establishing the competition? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result? 4. When there are high levels of disturbance in a community, the number of K-selected species should increase along with the overall diversity of the community. 5. In general, communities in early succession will be dominated by fast-growing species with r-selected life histories.
Cells are genetically programmed to die, responding to cell signals that can come from outside or inside the cell. This process is called necrosis and is a normal way to regulate cell numbers during fetal development and within tissues and organs after birth
a. true b. false
Gibberellic acid stimulates the cells of germinating grass seeds to produce mRNA molecules that code for hydrolytic enzymes. In this case the role of gibberellic acid can best be described as that of
A. a regulator of gene activity B. a stimulator of hydrolase secretion C. a stimulator of DNA replication D. an allosteric activator of hydrolase E. an activator of translation