The osmoregulatory and ionoregulatory problems facing a saltwater fish are
A. loss of water and loss of ions.
B. loss of water and gain of ions.
C. gain of water and loss of ions.
D. gain of water and gain of ions.
E. buildup of urea in tissues.
B. loss of water and gain of ions.
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________ describes an organism that can function in an aerobic or anaerobic environment.
Fill in the blank(s) with the appropriate word(s).
What are two main reasons why DNA replication is so error-free?
What will be an ideal response?
In plant cells, auxin binds to a
a. cell surface receptor and triggers the ras/raf pathway. b. nuclear receptor that changes its shape so that it can bind to and activate genes. c. receptor ubiquitin ligase that stimulates the degradation of transcriptional repressors, resulting in activation of genes. d. cell surface molecule that stimulates fluid uptake.
It is possible to determine the nature of an animal diet just by looking at the teeth of the animal.
Answer the following statement true (T) or false (F)