The filtration step in the formation of urine for animals sorts materials only by
A. whether they are charged or not.
B. overall size with cells and proteins usually being kept out of the filtrate.
C. whether the substance in question is a waste product or not.
D. whether they contain nitrogen or not.
E. the hydration state of the body.
Answer: B
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Which of the following is a reason for the occurrence of a lag phase in a bacterial growth curve?
A. The medium may be different from the previous growth medium so that the cells must synthesize new enzymes to use different nutrients. B. The cells may be old and depleted of ATP, essential cofactors, and ribosomes that must be synthesized before growth can begin. C. The organisms may have been injured and require time to recover. D. All of these are potential reasons.
Is reverse transcriptase a RNA-dependent DNA polymerase, or a DNA-dependent DNA polymerase?
A. It is a DNA-dependent DNA polymerase B. It is a RNA-dependent DNA polymerase. C. It is both a a DNA-dependent DNA polymerase and a RNA-dependent DNA polymerase. D. It is neither, reverse transcriptase is actually a DNA-dependent RNA polymerase.
The ________ class of immunoglobulins is the most common type and is the only type that can cross the placenta to pass on the mother's acquired immunity to the developing fetus
Fill in the blank(s) with correct word
Functions of the smooth endoplasmic reticulum include ________
A) steroid synthesis, protein synthesis, and drug detoxification B) lipid synthesis, protein synthesis, and drug detoxification C) lipid synthesis, steroid synthesis, and drug detoxification D) lipid synthesis, steroid synthesis, and storage of genetic information